built

# Conflicts:
#	Assets/Darkmatter/Content/Fonts/static/Fredoka-Bold SDF Blue Outline.asset

Assets/AddressableAssetsData/AddressableAssetSettings.asset

@@ -15,7 +15,8 @@ MonoBehaviour:
   m_DefaultGroup: 0e030d5498bfe4ffd8443c796618c539
   m_currentHash:
     serializedVersion: 2
-    Hash: 00000000000000000000000000000000
+    Hash: 9c85511c3b292d6ea9a478a45ca9832c
+  m_ExtractTypeTreeData: 0
   m_OptimizeCatalogSize: 0
   m_BuildRemoteCatalog: 0
   m_CatalogRequestsTimeout: 0

Assets/AddressableAssetsData/AssetGroups/Drawing.asset

@@ -21,12 +21,24 @@ MonoBehaviour:
     m_SerializedLabels:
     - drawing
     FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 14027365d88f82745bd4019ac24a4a48
+    m_Address: Rooster
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
   - m_GUID: 14477b5d35d0be9439ecb935f1c4e64e
     m_Address: Donut
     m_ReadOnly: 0
     m_SerializedLabels:
     - drawing
     FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 18367bdefdff1504fb125f7abf8d1283
+    m_Address: Motorcycle
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
   - m_GUID: 2043f692673a79543afed5cb879f0e04
     m_Address: Five
     m_ReadOnly: 0
@@ -39,18 +51,48 @@ MonoBehaviour:
     m_SerializedLabels:
     - drawing
     FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 2d13a177a6749834288f5e88a973fee7
+    m_Address: Yak
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
   - m_GUID: 2d55441a1a6751c45bb9af623301426e
     m_Address: Car
     m_ReadOnly: 0
     m_SerializedLabels:
     - drawing
     FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 2ee6ed56b9746934386767eca8c7a128
+    m_Address: Pankha
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
   - m_GUID: 364f644d962504fa7ac2f382800014ea
     m_Address: apple
     m_ReadOnly: 0
     m_SerializedLabels:
     - drawing
     FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 37724d82877cdd742b46da6b173015e0
+    m_Address: Tipper
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 3dc99c70dccf80940bb59c8744ad6893
+    m_Address: Butterfly
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 3f2894c3e52b9034fb38c2d61987e19c
+    m_Address: Temple
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
   - m_GUID: 4474b93704045a740ba9b8114e8a5238
     m_Address: Fish
     m_ReadOnly: 0
@@ -63,24 +105,90 @@ MonoBehaviour:
     m_SerializedLabels:
     - drawing
     FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 4986d20a529345f48a5c05dc039848b5
+    m_Address: Snow Leopard
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 55bd536848430a14290186903c3ccc79
+    m_Address: Ketli
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 5c0e5d19eecbfae43a61b7c6145357a9
+    m_Address: Dashain Ping
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 5d02c6b7028e54e479bf1b645b4fcf44
+    m_Address: Madal
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 5f3b8273533c8514cbc5f46cf86f90e8
+    m_Address: Diyo
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
   - m_GUID: 62ae112e11b695a40b889d773a36f8bd
     m_Address: Elephant
     m_ReadOnly: 0
     m_SerializedLabels:
     - drawing
     FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 67fc4e3245778f34083cfec4de5572ab
+    m_Address: Laligurans
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 6b911e576e57c68468991e31fe634b37
+    m_Address: Eagle
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
   - m_GUID: 6e36ba5d4763c694289c8ca75ee81449
     m_Address: Bus
     m_ReadOnly: 0
     m_SerializedLabels:
     - drawing
     FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 88e19e9e182745c48825ef3852cf8f4c
+    m_Address: Umbrella
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
   - m_GUID: 8cdc379bbe2529a419e5ce0eedcbb09e
     m_Address: Giraffe
     m_ReadOnly: 0
     m_SerializedLabels:
     - drawing
     FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 8efb0b102f9afc04da1b0fbfbcf1e764
+    m_Address: Doll
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 9274ef6670e95f04283827da968c8e8b
+    m_Address: Peacock
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: 949b2f7f7192a4c40b11a6b2a88a4d96
+    m_Address: Chura
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
   - m_GUID: 971be7b01d5eef24fa58094805ea92b9
     m_Address: Kite
     m_ReadOnly: 0
@@ -93,12 +201,66 @@ MonoBehaviour:
     m_SerializedLabels:
     - drawing
     FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: a0b17d65fcd1db642acd02e569d2ab18
+    m_Address: Tempo
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
   - m_GUID: a2ef043d1d7051c47a68e2ebce7bd3dd
     m_Address: Dog
     m_ReadOnly: 0
     m_SerializedLabels:
     - drawing
     FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: a3267b093c298c146b47cbc2dec66201
+    m_Address: Crocodile
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: a3e107832ef0cd044b55484d4d084b2e
+    m_Address: Rhino
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: a80d3a0f58b23a04fa7e256dcbde84ea
+    m_Address: Mirga
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: b25eb4fe03b3fa44cba09f957cb66f0f
+    m_Address: Ping
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: b900a31d7a581b44880c1c1c0fd2120b
+    m_Address: Khukuri
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: b91952879cc013c4a937230bcfc50a13
+    m_Address: Monkey
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: bfafeadd98627734cabbb911a519be0e
+    m_Address: Mandala
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: d9cb166d2b3929646a141aa69bafabf3
+    m_Address: danfe
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
   - m_GUID: dc24a6d2802de5d4298d1da3d1415e97
     m_Address: Envelop
     m_ReadOnly: 0
@@ -111,12 +273,60 @@ MonoBehaviour:
     m_SerializedLabels:
     - drawing
     FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: e01d5e1bee4eb7d4b897466911d9ba5d
+    m_Address: Mala
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: e4fa512c35aded6499b818ff5844fa65
+    m_Address: Gagri
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: ee932fc542864974595b8f1114a85f06
+    m_Address: Bag
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: ef139978c562d1e49a73714f90943327
+    m_Address: Parrot
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
   - m_GUID: f3200c6715fea4a41bc71c0314b519cd
     m_Address: Frog
     m_ReadOnly: 0
     m_SerializedLabels:
     - drawing
     FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: f64d814175be99b409d6b1c94e4b424c
+    m_Address: Tractor
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: f87bb07e8452a5b4c9ad8dc140bc8e73
+    m_Address: Cat
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: f8a1809740bda3247a55aee5355ccebf
+    m_Address: Tiger
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
+  - m_GUID: fb4d005ac1c2506438718430fb29cfb2
+    m_Address: Rabbit
+    m_ReadOnly: 0
+    m_SerializedLabels:
+    - drawing
+    FlaggedDuringContentUpdateRestriction: 0
   m_ReadOnly: 0
   m_Settings: {fileID: 11400000, guid: 4a94ef317c3674edd8270e4ed15031f6, type: 2}
   m_SchemaSet:

Assets/Darkmatter/Code/Core/Contracts/Features/Coloring/IColoringController.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Threading;
 using Cysharp.Threading.Tasks;
@@ -20,6 +21,7 @@ public interface IColoringController
     bool IsPlayingCompletionAnimation { get; }
 
     bool HasNonAuthoredColors { get; }
+    IDisposable UseNonZoomedView();
     void ResetAll();
     void Clear();
-}
+}

Assets/Darkmatter/Code/Core/Contracts/Features/DrawingCatalog/IDrawingTemplate.cs

@@ -9,10 +9,12 @@ namespace Darkmatter.Core.Contracts.Features.DrawingCatalog
     {
         string Id { get; }
         string DisplayName { get; }
+        int Difficulty { get; }
         Sprite DefaultThumbnail { get; }
         GameObject DrawingPrefab { get; }
         GameObject ColoringPrefab { get; }
         GameObject CompletionAnimationPrefab { get; }
+        AudioClip CompletionSound { get; }
         IReadOnlyList<ShapeSO> Pieces { get; }
         IReadOnlyList<ColorRegionDTO> Regions { get; }
         string ColorPaletteId { get; }

Assets/Darkmatter/Code/Core/Contracts/Features/DrawingCatalog/IDrawingTemplateCatalog.cs

@@ -6,9 +6,12 @@ namespace Darkmatter.Core.Contracts.Features.DrawingCatalog
 {
     public interface IDrawingTemplateCatalog
     {
-        UniTask FetchAsync(); 
+        UniTask FetchAsync();
         IReadOnlyList<string> AllTemplateIds { get; }
-        UniTask<Sprite> GetThumbnailAsync(string id);
+        // owned = true when the sprite (and its texture) were created for this call from a
+        // saved thumbnail on disk — the caller must Destroy() both when done. owned = false
+        // means the template's default thumbnail asset, which must NOT be destroyed.
+        UniTask<(Sprite sprite, bool owned)> GetThumbnailAsync(string id);
         UniTask<IDrawingTemplate> LoadAsync(string id);
         void ReleaseAll();
         string GetNextTemplate(string currentId);

Assets/Darkmatter/Code/Core/Contracts/Services/Analytics/AnalyticsEvents.cs

@@ -11,9 +11,9 @@ namespace Darkmatter.Core.Contracts.Services.Analytics
         // Onboarding / activation funnel
         public const string IntroStarted = "intro_started";
         public const string IntroCompleted = "intro_completed";
-        public const string TutorialStarted = "tutorial_started";
+        public const string TutorialStarted = "tutorial_begin";
         public const string TutorialStepCompleted = "tutorial_step_completed";
-        public const string TutorialCompleted = "tutorial_completed";
+        public const string TutorialCompleted = "tutorial_complete";
         public const string PlayClicked = "play_clicked";
         public const string FirstDrawingStarted = "first_drawing_started";
 
@@ -32,9 +32,9 @@ namespace Darkmatter.Core.Contracts.Services.Analytics
         public const string ShapeAssembled = "shape_assembled";
         public const string ColorApplied = "color_applied";
 
-        // Progression & content (GA4 recommended level_start / level_complete)
+        // Progression & content. level_start and level_end are GA4-recommended games events.
         public const string LevelStart = "level_start";
-        public const string LevelComplete = "level_complete";
+        public const string LevelComplete = "level_end";
         public const string AllContentCompleted = "all_content_completed";
 
         // Gallery capture (pre-existing)

Assets/Darkmatter/Code/Core/Contracts/Services/Analytics/AnalyticsParams.cs

@@ -4,14 +4,14 @@ namespace Darkmatter.Core.Contracts.Services.Analytics
     /// Canonical analytics parameter keys. Pass a consistent set on every gameplay event so reports can
     /// answer "which drawing did people quit on", not just "how many quit". Each key used in reports must
     /// be registered as a Custom Dimension in the Firebase console. GA4 limit: 25 params per event.
-    /// GA4-recommended events (level_start/level_complete/ad_impression) reuse GA4's reserved param names
+    /// GA4-recommended events (level_start/level_end/ad_impression) reuse GA4's reserved param names
     /// (level_name, success, value, currency, ad_platform, ad_format, ad_unit_name) so they're recognised.
     /// </summary>
     public static class AnalyticsParams
     {
         // Content identity
         public const string DrawingId = "drawing_id";
-        public const string LevelName = "level_name"; // GA4 reserved (level_start/level_complete)
+        public const string LevelName = "level_name"; // GA4 reserved (level_start/level_end)
 
         // Tutorial
         public const string StepId = "step_id";
@@ -23,7 +23,7 @@ namespace Darkmatter.Core.Contracts.Services.Analytics
         public const string Attempts = "attempts";
         public const string ApplyIndex = "apply_index";
         public const string CompletionCount = "completion_count";
-        public const string Success = "success"; // GA4 reserved (level_complete)
+        public const string Success = "success"; // GA4 reserved (level_end)
 
         // Monetization (GA4 ad_impression reserved names)
         public const string Value = "value";

Assets/Darkmatter/Code/Core/Contracts/Services/Capture/ICaptureService.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Threading;
 using Cysharp.Threading.Tasks;
 using UnityEngine;
@@ -7,6 +8,6 @@ namespace Darkmatter.Core.Contracts.Services.Capture
     public interface ICaptureService
     {
         UniTask<byte[]> CapturePngAsync(GameObject captureObject, float scale,
-            CancellationToken cancellationToken = default);
+            Func<IDisposable> captureViewScopeFactory = null, CancellationToken cancellationToken = default);
     }
-}
+}

Assets/Darkmatter/Code/Core/Data/Signals/Features/Capture/GallerySaveCompletedSignal.cs

@@ -1,4 +1,8 @@
 namespace Darkmatter.Core.Data.Signals.Features.Capture
 {
-    public record struct GallerySaveCompletedSignal(bool Success);
+    /// <summary>
+    /// TemplateId identifies which drawing was saved; publishers outside gameplay (art book) must set it
+    /// because there is no active drawing for analytics to fall back on there.
+    /// </summary>
+    public record struct GallerySaveCompletedSignal(bool Success, string TemplateId = null);
 }

Assets/Darkmatter/Code/Core/Data/Signals/Features/DrawingCatalog/ColorbookShownSignal.cs

@@ -0,0 +1,10 @@
+namespace Darkmatter.Core
+{
+    /// <summary>
+    /// The drawing-catalog (colorbook) screen became visible: scene entry (play / back / next) or
+    /// returning from the art book. Distinct from <see cref="OpenColorBookSignal"/>, which is the
+    /// command to show the view and only fires on one navigation path. Analytics keys colorbook_opened
+    /// and abandoned-drawing detection off this.
+    /// </summary>
+    public record struct ColorbookShownSignal;
+}

Assets/Darkmatter/Code/Core/Data/Signals/Features/DrawingCatalog/ColorbookShownSignal.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: fa0fb32346ff54da3a9bbfec9f763cf2

Assets/Darkmatter/Code/Core/Data/Static/Features/DrawingTemplate/DrawingTemplateSO.cs

@@ -12,20 +12,29 @@ namespace Darkmatter.Core.Data.Static.Features.DrawingTemplate
     {
         [SerializeField] private string id;
         [SerializeField] private string displayName;
+        [SerializeField, Min(0), Tooltip("0 = auto (pieces + regions). Any positive value overrides the computed difficulty.")]
+        private int difficultyOverride;
         [SerializeField] private Sprite defaultThumbnail;
         [SerializeField] private GameObject drawingPrefab;
         [SerializeField] private GameObject coloringPrefab;
         [SerializeField] private GameObject completionAnimationPrefab;
+        [SerializeField] private AudioClip completionSound;
         [SerializeField] private List<ShapeSO> pieces = new();
         [SerializeField] private List<RegionAuthoring> regions = new();
         [SerializeField] private string colorPaletteId = "defaultPalette";
 
         public string Id => id;
         public string DisplayName => displayName;
+        // Workload-based: every shape to place and region to color adds one point.
+        // A positive difficultyOverride replaces the computed value.
+        public int AutoDifficulty => pieces.Count + regions.Count;
+        public int Difficulty => difficultyOverride > 0 ? difficultyOverride : AutoDifficulty;
+        public bool HasDifficultyOverride => difficultyOverride > 0;
         public Sprite DefaultThumbnail => defaultThumbnail;
         public GameObject DrawingPrefab => drawingPrefab;
         public GameObject ColoringPrefab => coloringPrefab;
         public GameObject CompletionAnimationPrefab => completionAnimationPrefab;
+        public AudioClip CompletionSound => completionSound;
         public IReadOnlyList<ShapeSO> Pieces => pieces;
         public IReadOnlyList<ColorRegionDTO> Regions => Array.Empty<ColorRegionDTO>();
         public string ColorPaletteId => colorPaletteId;
@@ -34,7 +43,7 @@ namespace Darkmatter.Core.Data.Static.Features.DrawingTemplate
 
 #if UNITY_EDITOR
         public void EditorSet(string newId, string newDisplayName, Sprite thumbnail,
-            GameObject drawing, GameObject coloring, GameObject completionAnimation,
+            GameObject drawing, GameObject coloring, GameObject completionAnimation, AudioClip completionSoundClip,
             List<ShapeSO> newPieces,
             List<RegionAuthoring> newRegions, string paletteId)
         {
@@ -44,6 +53,7 @@ namespace Darkmatter.Core.Data.Static.Features.DrawingTemplate
             drawingPrefab = drawing;
             coloringPrefab = coloring;
             completionAnimationPrefab = completionAnimation;
+            completionSound = completionSoundClip;
             pieces = newPieces ?? new List<ShapeSO>();
             regions = newRegions ?? new List<RegionAuthoring>();
             colorPaletteId = paletteId;

Assets/Darkmatter/Code/Editor.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 2a01b1f301d474e39808b73160a98677
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Darkmatter/Code/Editor/AddSelectedPrefabToPaperRoot.cs

@@ -0,0 +1,78 @@
+using UnityEditor;
+using UnityEditor.SceneManagement;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+namespace Darkmatter.EditorTools
+{
+    public static class AddSelectedPrefabToPaperRoot
+    {
+        [MenuItem("Tools/Colorbook/Add Selected Prefab To PaperRoot")]
+        private static void AddSelected()
+        {
+            var prefab = Selection.activeObject as GameObject;
+            if (prefab == null || PrefabUtility.GetPrefabAssetType(prefab) == PrefabAssetType.NotAPrefab)
+            {
+                EditorUtility.DisplayDialog(
+                    "Select a prefab",
+                    "Select a drawing, coloring, or animation prefab in the Project window first.",
+                    "OK");
+                return;
+            }
+
+            var paperRoot = FindPaperRoot();
+            if (paperRoot == null)
+            {
+                EditorUtility.DisplayDialog(
+                    "PaperRoot not found",
+                    "Open the Gameplay scene and make sure it contains an object named PaperRoot.",
+                    "OK");
+                return;
+            }
+
+            var instance = PrefabUtility.InstantiatePrefab(prefab, paperRoot.scene) as GameObject;
+            if (instance == null) return;
+
+            Undo.RegisterCreatedObjectUndo(instance, $"Add {prefab.name} to PaperRoot");
+            Undo.SetTransformParent(instance.transform, paperRoot.transform, "Parent prefab to PaperRoot");
+
+            if (instance.transform is RectTransform rectTransform)
+            {
+                rectTransform.anchorMin = Vector2.zero;
+                rectTransform.anchorMax = Vector2.one;
+                rectTransform.anchoredPosition = Vector2.zero;
+                rectTransform.sizeDelta = Vector2.zero;
+                rectTransform.localScale = Vector3.one;
+            }
+            else
+            {
+                instance.transform.localPosition = Vector3.zero;
+                instance.transform.localRotation = Quaternion.identity;
+                instance.transform.localScale = Vector3.one;
+            }
+
+            Selection.activeGameObject = instance;
+            EditorSceneManager.MarkSceneDirty(paperRoot.scene);
+        }
+
+        [MenuItem("Tools/Colorbook/Add Selected Prefab To PaperRoot", true)]
+        private static bool ValidateAddSelected()
+        {
+            return !EditorApplication.isPlayingOrWillChangePlaymode;
+        }
+
+        private static GameObject FindPaperRoot()
+        {
+            var activeScene = SceneManager.GetActiveScene();
+            foreach (var root in activeScene.GetRootGameObjects())
+            {
+                var transforms = root.GetComponentsInChildren<Transform>(true);
+                foreach (var candidate in transforms)
+                    if (candidate.name == "PaperRoot")
+                        return candidate.gameObject;
+            }
+
+            return null;
+        }
+    }
+}

Assets/Darkmatter/Code/Editor/AddSelectedPrefabToPaperRoot.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 675d955c682824cd9904fb2e96517df1

Assets/Darkmatter/Code/Features/AppBoot/Features.AppBoot.asmdef

@@ -6,7 +6,8 @@
         "GUID:c1c03c0e5b2f4412b9f2be1c20d6a9b1",
         "GUID:b4c9f7fbf1e144933a1797dc208ece5f",
         "GUID:b0214a6008ed146ff8f122a6a9c2f6cc",
-        "GUID:f51ebe6a0ceec4240a699833d6309b23"
+        "GUID:f51ebe6a0ceec4240a699833d6309b23",
+        "GUID:75469ad4d38634e559750d17036d5f7c"
     ],
     "includePlatforms": [],
     "excludePlatforms": [],

Assets/Darkmatter/Code/Features/AppBoot/Flow/AdaptiveFrameRate.cs

@@ -0,0 +1,48 @@
+using UnityEngine;
+using UnityEngine.InputSystem;
+using UnityEngine.Rendering;
+using VContainer.Unity;
+
+namespace Darkmatter.Features.AppBoot.Flow
+{
+    // A coloring page is static most of the time; re-rendering it at a locked 60 fps only
+    // turns battery into heat. Keep the player loop at 60 Hz (input still sampled every
+    // frame, so the first touch never lands on a skipped frame) but render every other
+    // frame while nothing has been touched for a few seconds.
+    public sealed class AdaptiveFrameRate : ITickable
+    {
+        private const float FullRateHoldSeconds = 3f;
+        private const int IdleRenderInterval = 2; // 60 Hz loop -> 30 fps rendering when idle
+
+        private float _lastInteractionTime;
+
+        public AdaptiveFrameRate()
+        {
+            // Treat boot as an interaction so the intro video starts at full rate.
+            _lastInteractionTime = Time.unscaledTime;
+        }
+
+        public void Tick()
+        {
+            if (IsPointerPressed())
+                _lastInteractionTime = Time.unscaledTime;
+
+            var desired = Time.unscaledTime - _lastInteractionTime < FullRateHoldSeconds
+                ? 1
+                : IdleRenderInterval;
+
+            if (OnDemandRendering.renderFrameInterval != desired)
+                OnDemandRendering.renderFrameInterval = desired;
+        }
+
+        private static bool IsPointerPressed()
+        {
+            var touchscreen = Touchscreen.current;
+            if (touchscreen != null && touchscreen.primaryTouch.press.isPressed)
+                return true;
+
+            var mouse = Mouse.current;
+            return mouse != null && mouse.leftButton.isPressed;
+        }
+    }
+}

Assets/Darkmatter/Code/Features/AppBoot/Flow/AdaptiveFrameRate.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: ee0bbb69e2ec44637a7f5fb6f18a2518

Assets/Darkmatter/Code/Features/AppBoot/Flow/AppBootFlow.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Threading;
 using Cysharp.Threading.Tasks;
 using Darkmatter.Core.Contracts.Features.Progression;
@@ -14,6 +15,10 @@ namespace Darkmatter.Features.AppBoot.Flow
 {
     public class AppBootFlow : IAsyncStartable
     {
+        private const int IntroPrepareTimeoutMs = 3000;
+        private const float IntroMinimumFallbackSeconds = 6f;
+        private const float IntroFallbackPaddingSeconds = 2f;
+
         private readonly AppBootSceneRefs _sceneRefs;
         private readonly ISceneService _sceneService;
         private readonly IEventBus _eventBus;
@@ -30,36 +35,96 @@ namespace Darkmatter.Features.AppBoot.Flow
 
         public async UniTask StartAsync(CancellationToken cancellation = default)
         {
+            // Entry points run in serviceModules registration order and this module is near the front.
+            // Everything below LoadAsync completes synchronously, so without a real yield the
+            // IntroStartedSignal publish would happen before later-registered subscribers
+            // (e.g. AnalyticsTracker) have run Start() — the event bus has no replay, so they'd miss it.
+            await UniTask.Yield();
+
 #if UNITY_ANDROID || UNITY_IOS
             Application.targetFrameRate = 60;
 #endif
             Screen.sleepTimeout = SleepTimeout.NeverSleep;
             await _progression.LoadAsync();
 
-            var tcs = new UniTaskCompletionSource();
             var player = _sceneRefs.IntroVideoPlayer;
-
+            var introTask = PlayIntroAsync(player, cancellation);
-            void OnDone(VideoPlayer vp)
-            {
-                vp.loopPointReached -= OnDone;
-                tcs.TrySetResult();
-            }
-
-            player.loopPointReached += OnDone;
-            player.Play();
-            _eventBus.Publish(new IntroStartedSignal());
             await _sceneService.LoadSceneAsync(nameof(GameScene.MainMenu), null, cancellation);
 
-            await tcs.Task.AttachExternalCancellation(cancellation);
+            await introTask.AttachExternalCancellation(cancellation);
+
+            CleanupIntro(player);
+            if (_sceneRefs.IntroCanvas != null)
+                UnityEngine.Object.Destroy(_sceneRefs.IntroCanvas.gameObject);
+            _eventBus.Publish(new IntroCompletedSignal());
+        }
+
+        private async UniTask PlayIntroAsync(VideoPlayer player, CancellationToken cancellation)
+        {
+            if (player == null)
+                return;
+
+            var prepared = new UniTaskCompletionSource();
+            var completed = new UniTaskCompletionSource();
+
+            void OnPrepared(VideoPlayer vp) => prepared.TrySetResult();
+
+            void OnDone(VideoPlayer vp) => completed.TrySetResult();
+
+            void OnError(VideoPlayer vp, string message)
+            {
+                Debug.LogWarning($"[AppBootFlow] Intro video error: {message}");
+                completed.TrySetResult();
+                prepared.TrySetResult();
+            }
+
+            player.prepareCompleted += OnPrepared;
+            player.loopPointReached += OnDone;
+            player.errorReceived += OnError;
+
+            try
+            {
+                if (!player.isPrepared)
+                {
+                    player.Prepare();
+                    await UniTask.WhenAny(
+                        prepared.Task,
+                        UniTask.Delay(IntroPrepareTimeoutMs, cancellationToken: cancellation));
+                }
+
+                player.Play();
+                _eventBus.Publish(new IntroStartedSignal());
+
+                await UniTask.WhenAny(
+                    completed.Task,
+                    UniTask.Delay(GetIntroFallbackTimeout(player), cancellationToken: cancellation));
+            }
+            finally
+            {
+                player.prepareCompleted -= OnPrepared;
+                player.loopPointReached -= OnDone;
+                player.errorReceived -= OnError;
+            }
+        }
+
+        private static TimeSpan GetIntroFallbackTimeout(VideoPlayer player)
+        {
+            var length = player != null && player.length > 0d
+                ? (float)player.length
+                : IntroMinimumFallbackSeconds;
+
+            return TimeSpan.FromSeconds(Mathf.Max(IntroMinimumFallbackSeconds, length + IntroFallbackPaddingSeconds));
+        }
+
+        private static void CleanupIntro(VideoPlayer player)
+        {
+            if (player == null)
+                return;
 
             player.Stop();
             var rt = player.targetTexture;
             if (rt != null) rt.Release();
-
+            UnityEngine.Object.Destroy(player.gameObject);
-            if (_sceneRefs.IntroCanvas != null)
-                Object.Destroy(_sceneRefs.IntroCanvas.gameObject);
-            Object.Destroy(player.gameObject);
-            _eventBus.Publish(new IntroCompletedSignal());
         }
     }
-}
+}

Assets/Darkmatter/Code/Features/AppBoot/Installers/AppBootFeatureModule.cs

@@ -16,6 +16,7 @@ namespace Darkmatter.Features.AppBoot.Installers
             if (sceneRefs != null)
                 builder.RegisterComponent(sceneRefs);
             builder.RegisterEntryPoint<AppBootFlow>();
+            builder.RegisterEntryPoint<AdaptiveFrameRate>();
         }
     }
 }

Assets/Darkmatter/Code/Features/ArtBook/UI/ArtbookEntry.cs

@@ -1,7 +1,6 @@
 using System;
-using UnityEngine;
 
 namespace Darkmatter.Features.Artbook
 {
-    public record struct ArtbookEntry(string Id, string Name, Texture2D Thumbnail, DateTime UpdatedUtc);
+    public record struct ArtbookEntry(string Id, string Name, DateTime UpdatedUtc);
 }

Assets/Darkmatter/Code/Features/ArtBook/UI/ArtbookPresenter.cs

@@ -7,6 +7,7 @@ using Darkmatter.Core.Contracts.Features.DrawingCatalog;
 using Darkmatter.Core.Contracts.Features.Progression;
 using Darkmatter.Core.Contracts.Features.SaveGate;
 using Darkmatter.Core.Contracts.Services.Gallery;
+using Darkmatter.Core.Data.Signals.Features.Capture;
 using Darkmatter.Core.Data.Signals.Features.Drawing;
 using Darkmatter.Libs.Observer;
 using UnityEngine;
@@ -26,12 +27,13 @@ namespace Darkmatter.Features.Artbook
         private readonly IRewardedSaveGate _saveGate;
 
         private readonly List<ArtbookEntry> _entries = new();
-        private readonly List<Sprite> _ownedSprites = new();
+        private readonly List<Sprite> _visibleSprites = new();
-        private readonly List<Texture2D> _ownedTextures = new();
+        private readonly List<Texture2D> _visibleTextures = new();
         private Action _onClose;
         private CancellationTokenSource _cts;
         private IDisposable _openSubscription;
         private int _currentSpread;
+        private int _renderVersion;
 
         public ArtbookPresenter(
             ArtbookView view,
@@ -75,33 +77,40 @@ namespace Darkmatter.Features.Artbook
 
         private async UniTaskVoid LoadAndShowAsync(CancellationToken ct)
         {
-            ClearOwnedAssets();
+            try
-            _entries.Clear();
-            _currentSpread = 0;
-
-            await _catalog.FetchAsync();
-            if (ct.IsCancellationRequested) return;
-
-            foreach (var id in _catalog.AllTemplateIds)
             {
+                ClearVisibleAssets();
+                _entries.Clear();
+                _currentSpread = 0;
+
+                await _catalog.FetchAsync();
                 if (ct.IsCancellationRequested) return;
 
-                var progress = _progression.GetProgress(id);
+                foreach (var id in _catalog.AllTemplateIds)
-                if (progress is not { hasThumbnail: true }) continue;
+                {
+                    if (ct.IsCancellationRequested) return;
 
-                var texture = await _progression.GetCachedThumbnailAsync(id);
+                    var progress = _progression.GetProgress(id);
-                if (ct.IsCancellationRequested) return;
+                    if (progress is not { hasThumbnail: true }) continue;
-                if (texture == null) continue;
 
-                var template = await _catalog.LoadAsync(id);
+                    var template = await _catalog.LoadAsync(id);
-                if (ct.IsCancellationRequested) return;
+                    if (ct.IsCancellationRequested) return;
+                    if (template == null) continue;
 
-                _ownedTextures.Add(texture);
+                    _entries.Add(new ArtbookEntry(id, template.DisplayName, progress.Value.UpdatedUtc));
-                _entries.Add(new ArtbookEntry(id, template.DisplayName, texture, progress.Value.UpdatedUtc));
+                }
+
+                _entries.Sort((a, b) => b.UpdatedUtc.CompareTo(a.UpdatedUtc));
+                RenderSpread();
+            }
+            catch (OperationCanceledException)
+            {
+                // Opening/closing the art book can cancel the load at any await point.
+            }
+            catch (Exception e)
+            {
+                Debug.LogError($"[Artbook] Failed to load entries: {e}");
             }
-
-            _entries.Sort((a, b) => b.UpdatedUtc.CompareTo(a.UpdatedUtc));
-            RenderSpread();
         }
 
         private void HandlePrevSpreadClicked()
@@ -122,7 +131,7 @@ namespace Darkmatter.Features.Artbook
 
         private void RenderSpread()
         {
-            _view.SetSpread(GetLeftEntry(), SpriteFor(GetLeftEntry()), GetRightEntry(), SpriteFor(GetRightEntry()));
+            RenderSpreadAsync(++_renderVersion, _cts?.Token ?? CancellationToken.None).Forget();
             _view.SetNavigation(_currentSpread > 0, _currentSpread < TotalSpreads - 1);
         }
 
@@ -138,13 +147,51 @@ namespace Darkmatter.Features.Artbook
             return idx < _entries.Count ? _entries[idx] : null;
         }
 
-        private Sprite SpriteFor(ArtbookEntry? entry)
+        private async UniTaskVoid RenderSpreadAsync(int version, CancellationToken ct)
         {
-            if (!entry.HasValue) return null;
+            var left = GetLeftEntry();
-            var tex = entry.Value.Thumbnail;
+            var right = GetRightEntry();
+            ClearVisibleAssets();
+            _view.SetSpread(left, null, right, null);
+
+            try
+            {
+                var leftSprite = await SpriteForAsync(left, version, ct);
+                var rightSprite = await SpriteForAsync(right, version, ct);
+                if (ct.IsCancellationRequested || version != _renderVersion)
+                {
+                    return;
+                }
+
+                _view.SetSpread(left, leftSprite, right, rightSprite);
+            }
+            catch (OperationCanceledException)
+            {
+                if (version == _renderVersion) ClearVisibleAssets();
+            }
+            catch (Exception e)
+            {
+                if (version == _renderVersion) ClearVisibleAssets();
+                Debug.LogError($"[Artbook] Failed to render spread: {e}");
+            }
+        }
+
+        private async UniTask<Sprite> SpriteForAsync(ArtbookEntry? entry, int version, CancellationToken ct)
+        {
+            if (!entry.HasValue || ct.IsCancellationRequested || version != _renderVersion) return null;
+
+            var tex = await _progression.GetCachedThumbnailAsync(entry.Value.Id);
+            if (ct.IsCancellationRequested || version != _renderVersion)
+            {
+                if (tex != null) UnityEngine.Object.Destroy(tex);
+                return null;
+            }
+
             if (tex == null) return null;
+
             var sprite = Sprite.Create(tex, new Rect(0, 0, tex.width, tex.height), new Vector2(0.5f, 0.5f), 100f);
-            _ownedSprites.Add(sprite);
+            _visibleTextures.Add(tex);
+            _visibleSprites.Add(sprite);
             return sprite;
         }
 
@@ -153,13 +200,45 @@ namespace Darkmatter.Features.Artbook
 
         private async UniTaskVoid SaveToGalleryAsync(ArtbookEntry? entry)
         {
-            if (!entry.HasValue || entry.Value.Thumbnail == null) return;
+            Texture2D texture = null;
-            var ct = _cts?.Token ?? CancellationToken.None;
+            try
-            // Same kid-friendly prompt + rewarded ad as the gameplay save button.
+            {
-            if (!await _saveGate.RequestSaveAsync(ct)) return;
+                if (!entry.HasValue) return;
-            await _gallery.SaveImageAsync(entry.Value.Thumbnail, entry.Value.Name, ct);
+                var ct = _cts?.Token ?? CancellationToken.None;
-            // The art book has no success popup of its own, so use the shared toast.
+                // Same kid-friendly prompt + rewarded ad as the gameplay save button.
-            await _saveGate.ShowSavedAsync(ct);
+                if (!await _saveGate.RequestSaveAsync(ct)) return;
+                texture = await _progression.GetCachedThumbnailAsync(entry.Value.Id);
+                if (texture == null) return;
+
+                // Mirror CaptureSystem's pairing: Started before the write, Completed(success) in
+                // finally — art-book saves land in the same gallery_save_* analytics funnel as
+                // gameplay saves.
+                _eventBus.Publish(new GallerySaveStartedSignal());
+                var success = false;
+                try
+                {
+                    await _gallery.SaveImageAsync(texture, entry.Value.Name, ct);
+                    success = true;
+                }
+                finally
+                {
+                    _eventBus.Publish(new GallerySaveCompletedSignal(success, entry.Value.Id));
+                }
+                // The art book has no success popup of its own, so use the shared toast.
+                await _saveGate.ShowSavedAsync(ct);
+            }
+            catch (OperationCanceledException)
+            {
+                // The art book was closed or replaced while saving.
+            }
+            catch (Exception e)
+            {
+                Debug.LogError($"[Artbook] Failed to save page: {e}");
+            }
+            finally
+            {
+                if (texture != null) UnityEngine.Object.Destroy(texture);
+            }
         }
 
         private void HandleLeftEditClicked() => OpenForEdit(GetLeftEntry());
@@ -169,27 +248,43 @@ namespace Darkmatter.Features.Artbook
         {
             if (!entry.HasValue) return;
             _eventBus.Publish(new DrawingSelectedSignal(entry.Value.Id));
+            StopActiveWork();
             _view.Hide();
         }
 
         private void HandleBackButtonClicked()
         {
             _onClose?.Invoke();
+            StopActiveWork();
             _view.Hide();
         }
 
         private void HandleColorbookButtonClicked()
         {
             _eventBus.Publish(new OpenColorBookSignal());
+            StopActiveWork();
             _view.Hide();
         }
 
+        private void StopActiveWork()
+        {
+            _renderVersion++;
+            _cts?.Cancel();
+            _view.SetSpread(null, null, null, null);
+            ClearVisibleAssets();
+        }
+
         private void ClearOwnedAssets()
         {
-            foreach (var s in _ownedSprites) UnityEngine.Object.Destroy(s);
+            ClearVisibleAssets();
-            foreach (var t in _ownedTextures) UnityEngine.Object.Destroy(t);
+        }
-            _ownedSprites.Clear();
+
-            _ownedTextures.Clear();
+        private void ClearVisibleAssets()
+        {
+            foreach (var s in _visibleSprites) UnityEngine.Object.Destroy(s);
+            foreach (var t in _visibleTextures) UnityEngine.Object.Destroy(t);
+            _visibleSprites.Clear();
+            _visibleTextures.Clear();
         }
 
         public void Dispose()
@@ -208,4 +303,4 @@ namespace Darkmatter.Features.Artbook
             ClearOwnedAssets();
         }
     }
-}
+}

Assets/Darkmatter/Code/Features/Capture/Systems/CaptureSystem.cs

@@ -51,17 +51,23 @@ namespace Darkmatter.Features.Capture
             // A null result keeps the existing thumbnail and skips the gallery write (both no-op on null).
             if (_coloring.IsPlayingCompletionAnimation) return null;
 
-            var png = await _captureService.CapturePngAsync(_refs.PaperRoot.gameObject, _config.CaptureScale, ct);
+            var png = await _captureService.CapturePngAsync(
+                _refs.PaperRoot.gameObject,
+                _config.CaptureScale,
+                _coloring.UseNonZoomedView,
+                ct);
             if (!saveToGallery || png == null || png.Length == 0) return png;
 
             var tex = new Texture2D(2, 2, TextureFormat.RGBA32, mipChain: false);
             var success = false;
+            // Started must pair 1:1 with the Completed publish in finally — a failed LoadImage or a
+            // throw in BuildFileNameAsync would otherwise emit Completed(false) with no Started.
+            _bus.Publish(new GallerySaveStartedSignal());
             try
             {
                 if (tex.LoadImage(png))
                 {
                     var fileName = await BuildFileNameAsync();
-                    _bus.Publish(new GallerySaveStartedSignal());
                     await _galleryService.SaveImageAsync(tex, fileName, ct);
                     success = true;
                 }
@@ -69,7 +75,7 @@ namespace Darkmatter.Features.Capture
             finally
             {
                 UnityEngine.Object.Destroy(tex);
-                _bus.Publish(new GallerySaveCompletedSignal(success));
+                _bus.Publish(new GallerySaveCompletedSignal(success, _progression.LastOpenedTemplateId));
             }
             return png;
         }

Assets/Darkmatter/Code/Features/ColorbookFlow/System/ColorbookFlowController.cs

@@ -68,7 +68,13 @@ public class ColorbookFlowController : IAsyncStartable, IDisposable
         // one VContainer cancels on teardown, and the linked _scopeCts may lag the callback order.
         if (cancellation.IsCancellationRequested || ct.IsCancellationRequested) return;
 
-        if (!_navigatingToGameplay) _loadingScreen.Hide();
+        if (!_navigatingToGameplay)
+        {
+            _loadingScreen.Hide();
+            // Catalog genuinely on screen — not a transit hop toward gameplay (edit/next relays land
+            // in this scene with _navigatingToGameplay already latched and never reveal the catalog).
+            _bus.Publish(new ColorbookShownSignal());
+        }
 
         PrewarmInterstitialAdAsync().Forget();
     }

Assets/Darkmatter/Code/Features/Coloring/Features.Coloring.asmdef

@@ -8,7 +8,8 @@
         "GUID:b4c9f7fbf1e144933a1797dc208ece5f",
         "GUID:b0214a6008ed146ff8f122a6a9c2f6cc",
         "GUID:f51ebe6a0ceec4240a699833d6309b23",
-        "GUID:80ecb87cae9c44d19824e70ea7229748"
+        "GUID:80ecb87cae9c44d19824e70ea7229748",
+        "GUID:75469ad4d38634e559750d17036d5f7c"
     ],
     "includePlatforms": [],
     "excludePlatforms": [],
@@ -19,4 +20,4 @@
     "defineConstraints": [],
     "versionDefines": [],
     "noEngineReferences": false
-}
+}

Assets/Darkmatter/Code/Features/Coloring/Installers/ColoringFeatureModule.cs

@@ -11,6 +11,7 @@ namespace Darkmatter.Features.Coloring
     public class ColoringFeatureModule : MonoBehaviour, IModule
     {
         [SerializeField] private ColorPaletteHolderView paletteHolderView;
+        [SerializeField] private ColoringPinchZoomController pinchZoomController;
 
         public void Register(IContainerBuilder builder)
         {
@@ -20,6 +21,7 @@ namespace Darkmatter.Features.Coloring
                 builder.RegisterEntryPoint<ColorPaletteHolderPresenter>().WithParameter(paletteHolderView);
             }
 
+            builder.RegisterComponent(pinchZoomController);
             builder.Register<IColorButtonFactory, ColorButtonFactory>(Lifetime.Singleton);
             builder.Register<ColoringStateRepository>(Lifetime.Singleton);
             builder.Register<IColoringController, ColoringController>(Lifetime.Singleton);

Assets/Darkmatter/Code/Features/Coloring/Systems/ColoringController.cs

@@ -7,8 +7,11 @@ using Darkmatter.Core.Contracts.Features.DrawingCatalog;
 using Darkmatter.Core.Contracts.Features.GameplayFlow;
 using Darkmatter.Core.Contracts.Features.History;
 using Darkmatter.Core.Contracts.Services.Assets;
+using Darkmatter.Core.Contracts.Services.Audio;
+using Darkmatter.Core.Data.Dynamic.Services.Audio;
 using Darkmatter.Core.Data.Signals.Features.Coloring;
 using Darkmatter.Core.Data.Static.Features.Coloring;
+using Darkmatter.Core.Enums.Services.Audio;
 using Darkmatter.Features.Coloring.Commands;
 using Darkmatter.Features.Coloring.UI;
 using Darkmatter.Libs.Observer;
@@ -28,11 +31,15 @@ public class ColoringController : IColoringController, IDisposable
     private readonly IUndoStack _history;
     private readonly IGameplaySceneRefs _refs;
     private readonly ColorPaletteHolderView _paletteHolder;
+    private readonly IAudioService _audioService;
 
     private GameObject _colorInstance;
     private GameObject _colorButtonPrefab;
     private GameObject _completionAnimationInstance;
     private CompletionAnimationView _completionAnimationView;
+    private AudioClip _completionSound;
+    private AudioHandle _completionSoundHandle = AudioHandle.Invalid;
+    private readonly ColoringPinchZoomController _pinchZoom;
     private bool _isPlayingCompletionAnimation;
     private readonly List<ColorRegionView> _regions = new();
     private readonly List<ColorButton> _buttons = new();
@@ -41,26 +48,30 @@ public class ColoringController : IColoringController, IDisposable
     public ColoringController(
         ColoringStateRepository repository,
         IColorButtonFactory buttonFactory,
+        ColoringPinchZoomController pinchZoom,
         IEventBus bus,
         IAssetProviderService assetProviderService,
         IUndoStack history,
         IGameplaySceneRefs refs,
-        ColorPaletteHolderView paletteHolder)
+        ColorPaletteHolderView paletteHolder,
+        IAudioService audioService)
     {
         _repository = repository;
         _buttonFactory = buttonFactory;
         _bus = bus;
         _assetProviderService = assetProviderService;
         _history = history;
+        _pinchZoom = pinchZoom;
         _refs = refs;
         _paletteHolder = paletteHolder;
+        _audioService = audioService;
     }
 
     public async UniTask InitializeRegionsAsync(IDrawingTemplate template,
         IReadOnlyDictionary<string, Color> savedColors, CancellationToken ct)
     {
         Clear();
-        _paletteHolder.Show();
+        _ = _paletteHolder.Show();
         await TryLoadColorButtonPrefabAsync(ct);
         ct.ThrowIfCancellationRequested();
         await TryLoadColorPaletteAsync(template, ct);
@@ -110,8 +121,11 @@ public class ColoringController : IColoringController, IDisposable
     {
         if (_completionAnimationInstance == null || _completionAnimationView == null) return;
         if (_colorInstance != null) _colorInstance.SetActive(false);
+        if (_pinchZoom != null)
+            _pinchZoom.ResetZoom();
         _completionAnimationInstance.SetActive(true);
         _isPlayingCompletionAnimation = true;
+        PlayCompletionSound();
         try
         {
             await _completionAnimationView.PlayAsync(ct);
@@ -124,6 +138,23 @@ public class ColoringController : IColoringController, IDisposable
         }
     }
 
+    // Starts the template's completion sound together with the completion animation.
+    // A OneShot is left to finish naturally on success; StopCompletionSound() (called from
+    // Clear) cuts it off if the controller is torn down mid-play.
+    private void PlayCompletionSound()
+    {
+        if (_audioService == null || _completionSound == null) return;
+        _completionSoundHandle = _audioService.Play(
+            new AudioRequest(_completionSound, AudioChannel.Sfx, AudioPlayMode.OneShot));
+    }
+
+    private void StopCompletionSound()
+    {
+        if (_audioService != null && _completionSoundHandle.IsValid)
+            _audioService.Stop(_completionSoundHandle);
+        _completionSoundHandle = AudioHandle.Invalid;
+    }
+
     public bool HasNonAuthoredColors
     {
         get
@@ -138,6 +169,14 @@ public class ColoringController : IColoringController, IDisposable
         }
     }
 
+    public IDisposable UseNonZoomedView()
+    {
+        if (_pinchZoom == null)
+            return null;
+
+        return _pinchZoom.UseNonZoomedView();
+    }
+
     public void ResetAll()
     {
         if (_regions.Count == 0) return;
@@ -154,6 +193,7 @@ public class ColoringController : IColoringController, IDisposable
     {
         _history.Drop();
         _isPlayingCompletionAnimation = false;
+        StopCompletionSound();
 
         foreach (var button in _buttons)
             if (button != null)
@@ -169,12 +209,16 @@ public class ColoringController : IColoringController, IDisposable
             _completionAnimationInstance = null;
             _completionAnimationView = null;
         }
+        _completionSound = null;
 
         if (_colorInstance != null)
         {
             UnityEngine.Object.Destroy(_colorInstance);
             _colorInstance = null;
         }
+
+        if (_pinchZoom != null)
+            _pinchZoom.SetTarget(null);
     }
 
     public void Dispose() => Clear();
@@ -182,12 +226,14 @@ public class ColoringController : IColoringController, IDisposable
     private void InitializeColorRegions(IDrawingTemplate template, IReadOnlyDictionary<string, Color> savedColors)
     {
         _colorInstance = UnityEngine.Object.Instantiate(template.ColoringPrefab, _refs.PaperRoot);
+        InitializePinchZoom(_refs.PaperRoot);
         if (template.CompletionAnimationPrefab != null)
         {
             _completionAnimationInstance = UnityEngine.Object.Instantiate(template.CompletionAnimationPrefab, _refs.PaperRoot);
             _completionAnimationView = _completionAnimationInstance.GetComponentInChildren<CompletionAnimationView>(includeInactive: true);
             _completionAnimationInstance.SetActive(false);
         }
+        _completionSound = template.CompletionSound;
         var views = _colorInstance.GetComponentsInChildren<ColorRegionView>(includeInactive: true);
 
         foreach (var region in views)
@@ -207,6 +253,17 @@ public class ColoringController : IColoringController, IDisposable
         }
     }
 
+    private void InitializePinchZoom(RectTransform target)
+    {
+        if (target == null)
+        {
+            return;
+        }
+
+        if (_pinchZoom != null)
+            _pinchZoom.SetTarget(target);
+    }
+
     private async UniTask TryLoadColorButtonPrefabAsync(CancellationToken ct)
     {
         if (_colorButtonPrefab != null) return;
@@ -231,4 +288,4 @@ public class ColoringController : IColoringController, IDisposable
         foreach (var color in _repository.SelectedPalette.Colors)
             _buttons.Add(_buttonFactory.Create(_colorButtonPrefab, color));
     }
-}
+}

Assets/Darkmatter/Code/Features/Coloring/Systems/ColoringPinchZoomController.cs

@@ -0,0 +1,454 @@
+using System;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.InputSystem;
+
+namespace Darkmatter.Features.Coloring.Systems
+{
+
+    public sealed class ColoringPinchZoomController : MonoBehaviour
+    {
+        private const float MinimumPinchDistance = 8f;
+        private const float PanZoomEpsilon = 0.0001f;
+
+        [SerializeField] private float minZoom = 1f;
+        [SerializeField] private float maxZoom = 3f;
+        [SerializeField] private float scrollZoomSensitivity = 0.0015f;
+
+        private RectTransform _target;
+        private RectTransform _parent;
+        private Canvas _canvas;
+        private Camera _eventCamera;
+
+        private bool _isPinching;
+        private float _currentZoom = 1f;
+        private Vector3 _baseScale = Vector3.one;
+        private Vector2 _baseAnchoredPosition;
+        private PanDragRelay _panRelay;
+
+        public void SetTarget(RectTransform target)
+        {
+            ResetZoom();
+            _target = target;
+            _parent = target != null ? target.parent as RectTransform : null;
+            _canvas = target != null ? target.GetComponentInParent<Canvas>() : null;
+            _eventCamera = ResolveEventCamera(_canvas);
+            _baseScale = target != null ? target.localScale : Vector3.one;
+            _baseAnchoredPosition = target != null ? target.anchoredPosition : Vector2.zero;
+            _currentZoom = 1f;
+            enabled = _target != null && _parent != null;
+
+            _panRelay = null;
+            if (_target != null)
+            {
+                _panRelay = _target.gameObject.GetComponent<PanDragRelay>();
+                if (_panRelay == null)
+                    _panRelay = _target.gameObject.AddComponent<PanDragRelay>();
+                _panRelay.Controller = this;
+            }
+
+            UpdatePanRelayState();
+        }
+
+        // While not zoomed the relay is disabled so the event system never resolves it as a
+        // drag target — sloppy kid taps keep registering as clicks (paints) exactly as before.
+        // Zoomed in, drags become pans and are suppressed as clicks by uGUI.
+        private void UpdatePanRelayState()
+        {
+            if (_panRelay != null)
+                _panRelay.enabled = _currentZoom > 1f + PanZoomEpsilon;
+        }
+
+        public void ResetZoom()
+        {
+            if (_target != null)
+            {
+                _target.localScale = _baseScale;
+                _target.anchoredPosition = _baseAnchoredPosition;
+            }
+
+            _currentZoom = 1f;
+            _isPinching = false;
+            UpdatePanRelayState();
+        }
+
+        public IDisposable UseNonZoomedView()
+        {
+            if (_target == null)
+                return null;
+
+            var state = new ViewState(_target.localScale, _target.anchoredPosition, _currentZoom);
+            ResetZoom();
+            return new NonZoomedViewScope(this, state);
+        }
+
+        private void Awake()
+        {
+            enabled = false;
+        }
+
+        private void Update()
+        {
+            if (_target == null || _parent == null)
+            {
+                enabled = false;
+                return;
+            }
+
+            if (TryApplyPinchZoom())
+            {
+                return;
+            }
+
+            _isPinching = false;
+            TryApplyScrollZoom();
+            TryApplyMousePan();
+        }
+
+        private bool TryApplyPinchZoom()
+        {
+            if (!TryGetTouchSamples(out TouchSample firstTouch, out TouchSample secondTouch))
+            {
+                return false;
+            }
+
+            float distance = Vector2.Distance(firstTouch.Position, secondTouch.Position);
+            if (distance < MinimumPinchDistance)
+            {
+                return true;
+            }
+
+            Vector2 midpoint = (firstTouch.Position + secondTouch.Position) * 0.5f;
+            if (!TryGetParentLocalPoint(midpoint, out Vector2 midpointLocal))
+            {
+                return true;
+            }
+
+            if (!_isPinching)
+            {
+                _isPinching = true;
+                return true;
+            }
+
+            float previousDistance = Vector2.Distance(firstTouch.PreviousPosition, secondTouch.PreviousPosition);
+            if (previousDistance < MinimumPinchDistance)
+            {
+                return true;
+            }
+
+            // Anchor the content point that was under the previous midpoint to the current
+            // midpoint: distance change zooms, midpoint movement pans — one gesture does both.
+            Vector2 previousMidpoint = (firstTouch.PreviousPosition + secondTouch.PreviousPosition) * 0.5f;
+            if (!TryGetParentLocalPoint(previousMidpoint, out Vector2 previousMidpointLocal))
+            {
+                return true;
+            }
+
+            float targetZoom = Mathf.Clamp(_currentZoom * (distance / previousDistance), minZoom, maxZoom);
+            ApplyZoomPan(previousMidpointLocal, midpointLocal, targetZoom);
+            return true;
+        }
+
+        private void TryApplyScrollZoom()
+        {
+            Mouse mouse = Mouse.current;
+            if (mouse == null)
+            {
+                return;
+            }
+
+            float scroll = mouse.scroll.ReadValue().y;
+            if (Mathf.Approximately(scroll, 0f))
+            {
+                return;
+            }
+
+            Vector2 screenPosition = mouse.position.ReadValue();
+            if (!IsInputPointAllowed(screenPosition))
+            {
+                return;
+            }
+
+            if (!TryGetParentLocalPoint(screenPosition, out Vector2 localPoint))
+            {
+                return;
+            }
+
+            float targetZoom = Mathf.Clamp(_currentZoom * (1f + scroll * scrollZoomSensitivity), minZoom, maxZoom);
+            ZoomTowards(localPoint, targetZoom);
+        }
+
+        private void ZoomTowards(Vector2 parentLocalPoint, float targetZoom)
+        {
+            if (Mathf.Approximately(targetZoom, _currentZoom))
+            {
+                return;
+            }
+
+            ApplyZoomPan(parentLocalPoint, parentLocalPoint, targetZoom);
+        }
+
+        private void ApplyZoomPan(Vector2 previousLocalPoint, Vector2 currentLocalPoint, float targetZoom)
+        {
+            Vector2 contentPoint = (previousLocalPoint - _target.anchoredPosition) / _currentZoom;
+            _currentZoom = targetZoom;
+            _target.localScale = _baseScale * _currentZoom;
+            _target.anchoredPosition = ClampPan(currentLocalPoint - contentPoint * _currentZoom);
+            UpdatePanRelayState();
+        }
+
+        // Editor/desktop convenience: drag with the right or middle mouse button to pan while zoomed.
+        private void TryApplyMousePan()
+        {
+            Mouse mouse = Mouse.current;
+            if (mouse == null || (!mouse.rightButton.isPressed && !mouse.middleButton.isPressed))
+            {
+                return;
+            }
+
+            if (_currentZoom <= 1f + PanZoomEpsilon)
+            {
+                return;
+            }
+
+            Vector2 delta = mouse.delta.ReadValue();
+            if (delta == Vector2.zero)
+            {
+                return;
+            }
+
+            Vector2 screenPosition = mouse.position.ReadValue();
+            if (!IsInputPointAllowed(screenPosition))
+            {
+                return;
+            }
+
+            if (!TryGetParentLocalPoint(screenPosition, out Vector2 currentLocal) ||
+                !TryGetParentLocalPoint(screenPosition - delta, out Vector2 previousLocal))
+            {
+                return;
+            }
+
+            _target.anchoredPosition = ClampPan(_target.anchoredPosition + (currentLocal - previousLocal));
+        }
+
+        // Single-finger (or left-mouse) drag pan, fed by PanDragRelay on the paper root.
+        // Going through uGUI's drag pipeline matters: once the drag threshold is crossed the
+        // event system cancels the pending click, so a pan can never paint the region the
+        // finger ends on — a plain tap still paints.
+        private void OnPanDrag(PointerEventData eventData, Transform source)
+        {
+            if (_target == null || source != _target.transform)
+            {
+                return;
+            }
+
+            if (_isPinching || HasMultiTouch())
+            {
+                return; // two-finger gesture owns the view
+            }
+
+            if (_currentZoom <= 1f + PanZoomEpsilon)
+            {
+                return;
+            }
+
+            if (!TryGetParentLocalPoint(eventData.position, out Vector2 currentLocal) ||
+                !TryGetParentLocalPoint(eventData.position - eventData.delta, out Vector2 previousLocal))
+            {
+                return;
+            }
+
+            _target.anchoredPosition = ClampPan(_target.anchoredPosition + (currentLocal - previousLocal));
+        }
+
+        private static bool HasMultiTouch()
+        {
+            Touchscreen touchscreen = Touchscreen.current;
+            if (touchscreen == null)
+            {
+                return false;
+            }
+
+            int count = 0;
+            foreach (var touchControl in touchscreen.touches)
+            {
+                if (touchControl.press.isPressed && ++count > 1)
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        // The scaled paper must keep covering its zoom-1 footprint: panning can never expose
+        // background inside the area the drawing occupies when not zoomed.
+        private Vector2 ClampPan(Vector2 anchoredPosition)
+        {
+            if (_currentZoom <= 1f + PanZoomEpsilon)
+            {
+                return _baseAnchoredPosition;
+            }
+
+            Rect rect = _target.rect;
+            float growth = 1f - _currentZoom; // negative while zoomed in
+
+            float minX = _baseAnchoredPosition.x + rect.xMax * _baseScale.x * growth;
+            float maxX = _baseAnchoredPosition.x + rect.xMin * _baseScale.x * growth;
+            float minY = _baseAnchoredPosition.y + rect.yMax * _baseScale.y * growth;
+            float maxY = _baseAnchoredPosition.y + rect.yMin * _baseScale.y * growth;
+
+            return new Vector2(
+                Mathf.Clamp(anchoredPosition.x, minX, maxX),
+                Mathf.Clamp(anchoredPosition.y, minY, maxY));
+        }
+
+        private bool TryGetParentLocalPoint(Vector2 screenPoint, out Vector2 localPoint)
+        {
+            return RectTransformUtility.ScreenPointToLocalPointInRectangle(_parent, screenPoint, _eventCamera,
+                out localPoint);
+        }
+
+        private bool TryGetTouchSamples(out TouchSample firstTouch, out TouchSample secondTouch)
+        {
+            firstTouch = default;
+            secondTouch = default;
+
+            Touchscreen touchscreen = Touchscreen.current;
+            if (touchscreen == null)
+            {
+                return false;
+            }
+
+            int count = 0;
+            foreach (var touchControl in touchscreen.touches)
+            {
+                if (!touchControl.press.isPressed)
+                {
+                    continue;
+                }
+
+                Vector2 position = touchControl.position.ReadValue();
+                if (!IsInputPointAllowed(position))
+                {
+                    continue;
+                }
+
+                var sample = new TouchSample(position, touchControl.delta.ReadValue());
+                if (count == 0)
+                {
+                    firstTouch = sample;
+                }
+                else
+                {
+                    secondTouch = sample;
+                    return true;
+                }
+
+                count++;
+            }
+
+            return false;
+        }
+
+        private bool IsInputPointAllowed(Vector2 screenPoint)
+        {
+            return _target != null &&
+                   RectTransformUtility.RectangleContainsScreenPoint(_target, screenPoint, _eventCamera);
+        }
+
+        private static Camera ResolveEventCamera(Canvas canvas)
+        {
+            if (canvas == null || canvas.renderMode == RenderMode.ScreenSpaceOverlay)
+            {
+                return null;
+            }
+
+            return canvas.worldCamera;
+        }
+
+        private void RestoreView(ViewState state)
+        {
+            if (_target == null)
+                return;
+
+            _target.localScale = state.Scale;
+            _target.anchoredPosition = state.AnchoredPosition;
+            _currentZoom = state.CurrentZoom;
+            _isPinching = false;
+            UpdatePanRelayState();
+        }
+
+        private readonly struct ViewState
+        {
+            public readonly Vector3 Scale;
+            public readonly Vector2 AnchoredPosition;
+            public readonly float CurrentZoom;
+
+            public ViewState(Vector3 scale, Vector2 anchoredPosition, float currentZoom)
+            {
+                Scale = scale;
+                AnchoredPosition = anchoredPosition;
+                CurrentZoom = currentZoom;
+            }
+        }
+
+        private sealed class NonZoomedViewScope : IDisposable
+        {
+            private ColoringPinchZoomController _controller;
+            private readonly ViewState _state;
+
+            public NonZoomedViewScope(ColoringPinchZoomController controller, ViewState state)
+            {
+                _controller = controller;
+                _state = state;
+            }
+
+            public void Dispose()
+            {
+                if (_controller == null)
+                    return;
+
+                if (_controller != null)
+                    _controller.RestoreView(_state);
+
+                _controller = null;
+            }
+        }
+
+        private readonly struct TouchSample
+        {
+            public readonly Vector2 Position;
+            public readonly Vector2 PreviousPosition;
+            public readonly Vector2 Delta;
+
+            public TouchSample(Vector2 position, Vector2 delta)
+            {
+                Position = position;
+                PreviousPosition = position - delta;
+                Delta = delta;
+            }
+        }
+
+        // Runtime-attached to the paper root (SetTarget); regions are its children, so drags
+        // that start on a region bubble up here while taps stay clicks. Implementing the uGUI
+        // drag interfaces is what makes the event system suppress the region click on drag.
+        private sealed class PanDragRelay : MonoBehaviour, IBeginDragHandler, IDragHandler
+        {
+            internal ColoringPinchZoomController Controller;
+
+            public void OnBeginDrag(PointerEventData eventData)
+            {
+            }
+
+            public void OnDrag(PointerEventData eventData)
+            {
+                if (Controller != null)
+                {
+                    Controller.OnPanDrag(eventData, transform);
+                }
+            }
+        }
+    }
+}

Assets/Darkmatter/Code/Features/Coloring/Systems/ColoringPinchZoomController.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: ddf9e0ad8b4b4ee59470410f7cf40689
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Darkmatter/Code/Features/DrawingCatalog/Systems/DrawingCatalogController.cs

@@ -57,8 +57,8 @@ public sealed class DrawingCatalogController : IDrawingCatalogController
     private void Refresh()
     {
         _visible.Clear();
+        // Catalog already orders ids by difficulty (easiest first), then id.
         _visible.AddRange(_catalog.AllTemplateIds);
-        _visible.Sort(StringComparer.OrdinalIgnoreCase);
         ListChanged?.Invoke();
     }
 }

Assets/Darkmatter/Code/Features/DrawingCatalog/UI/DrawingCatalogButton.cs

@@ -13,8 +13,8 @@ namespace Darkmatter.Features.DrawingCatalog
         {
             Id = id;
             thumbnail.sprite = thumbnailSprite;
+            button.onClick.RemoveAllListeners();
             button.onClick.AddListener(onClick);
         }
     }
 }
-

Assets/Darkmatter/Code/Features/DrawingCatalog/UI/DrawingCatalogPresenter.cs

@@ -15,6 +15,7 @@ namespace Darkmatter.Features.DrawingCatalog
 
         private int _currentPage = 0;
         private int _totalPages = 1;
+        private const int RowCount = 2;
         private const int ItemPerPage = 8; //2 rows x 4 columns
 
         private readonly DrawingCatalogView _view;
@@ -24,6 +25,12 @@ namespace Darkmatter.Features.DrawingCatalog
         private readonly CancellationTokenSource _cts = new();
         private IDisposable _openSubscription;
 
+        // Sprites/textures decoded from saved thumbnails are created fresh on every refresh
+        // and are owned by this presenter — without destroying the previous batch each
+        // Colorbook visit leaks several MB per painted drawing until the OS kills the app.
+        private readonly List<Sprite> _ownedSprites = new();
+        private readonly List<Texture2D> _ownedTextures = new();
+
         public DrawingCatalogPresenter(DrawingCatalogView view, IDrawingCatalogController controller,
             IDrawingTemplateCatalog catalog, IEventBus eventBus)
         {
@@ -48,8 +55,14 @@ namespace Darkmatter.Features.DrawingCatalog
         }
 
         private void HandleOpenColorBookSignal(OpenColorBookSignal signal)
+        {
+            ShowCatalog();
+        }
+
+        private void ShowCatalog()
         {
             _view.Show();
+            _eventBus.Publish(new ColorbookShownSignal());
         }
 
         private void OnRightPageBtnClicked()
@@ -84,7 +97,7 @@ namespace Darkmatter.Features.DrawingCatalog
 
         private void OnArtBookBtnClicked()
         {
-           _eventBus.Publish(new OpenArtBookSignal(()=> _view.Show()));
+           _eventBus.Publish(new OpenArtBookSignal(ShowCatalog));
            _view.Hide();
         }
 
@@ -102,29 +115,86 @@ namespace Darkmatter.Features.DrawingCatalog
 
         private async UniTask RefreshAsync(CancellationToken ct)
         {
-            var ids = _controller.VisibleIds;
+            var newSprites = new List<Sprite>();
-            var vms = new List<CatalogItemVM>(ids.Count);
+            var newTextures = new List<Texture2D>();
+            var applied = false;
 
-            _totalPages = (int)Math.Ceiling(ids.Count / (float)ItemPerPage);
+            try
-            _currentPage = 0;
-
-            foreach (var id in ids)
             {
+                var ids = ToFixedRowGridOrder(_controller.VisibleIds);
+                var vms = new List<CatalogItemVM>(ids.Count);
+
+                _totalPages = (int)Math.Ceiling(ids.Count / (float)ItemPerPage);
+                _currentPage = 0;
+
+                foreach (var id in ids)
+                {
+                    if (ct.IsCancellationRequested) return;
+                    var (thumb, owned) = await _catalog.GetThumbnailAsync(id);
+                    if (owned)
+                    {
+                        newSprites.Add(thumb);
+                        newTextures.Add(thumb.texture);
+                    }
+
+                    vms.Add(new CatalogItemVM(id, thumb));
+                }
+
                 if (ct.IsCancellationRequested) return;
-                var thumb = await _catalog.GetThumbnailAsync(id);
+                _view.ResetScrollPosition();
-                vms.Add(new CatalogItemVM(id, thumb));
+                _view.SetItems(vms);
+                _view.SetPagination(_currentPage, _totalPages);
+
+                // Buttons now reference the new batch; the previous one can go.
+                DestroyOwnedThumbnails();
+                _ownedSprites.AddRange(newSprites);
+                _ownedTextures.AddRange(newTextures);
+                applied = true;
+
+                // Unblock InitializeAsync: items are now on screen, so the loading screen can hide.
+                _controller.NotifyPopulated();
+
+                // Cue the first-run tutorial that the catalog grid is on screen and tappable.
+                _eventBus.Publish(new DrawingCatalogReadySignal());
+            }
+            catch (Exception e)
+            {
+                Debug.LogError($"[DrawingCatalog] Failed to refresh catalog: {e}");
+            }
+            finally
+            {
+                // Aborted refresh (cancelled or threw): don't strand the freshly decoded batch.
+                if (!applied)
+                {
+                    foreach (var s in newSprites) UnityEngine.Object.Destroy(s);
+                    foreach (var t in newTextures) UnityEngine.Object.Destroy(t);
+                }
+
+                // Idempotent — always unblock the flow; a stuck loading screen is worse than
+                // an empty catalog.
+                _controller.NotifyPopulated();
+            }
+        }
+
+        private void DestroyOwnedThumbnails()
+        {
+            foreach (var s in _ownedSprites) UnityEngine.Object.Destroy(s);
+            foreach (var t in _ownedTextures) UnityEngine.Object.Destroy(t);
+            _ownedSprites.Clear();
+            _ownedTextures.Clear();
+        }
+
+        private static List<string> ToFixedRowGridOrder(IReadOnlyList<string> ids)
+        {
+            var ordered = new List<string>(ids.Count);
+
+            for (var row = 0; row < RowCount; row++)
+            {
+                for (var index = row; index < ids.Count; index += RowCount)
+                    ordered.Add(ids[index]);
             }
 
-            if (ct.IsCancellationRequested) return;
+            return ordered;
-            _view.ResetScrollPosition();
-            _view.SetItems(vms);
-            _view.SetPagination(_currentPage, _totalPages);
-
-            // Unblock InitializeAsync: items are now on screen, so the loading screen can hide.
-            _controller.NotifyPopulated();
-
-            // Cue the first-run tutorial that the catalog grid is on screen and tappable.
-            _eventBus.Publish(new DrawingCatalogReadySignal());
         }
 
         public void Dispose()
@@ -140,6 +210,7 @@ namespace Darkmatter.Features.DrawingCatalog
             _openSubscription?.Dispose();
             _cts.Cancel();
             _cts.Dispose();
+            DestroyOwnedThumbnails();
         }
     }
-}
+}

Assets/Darkmatter/Code/Features/DrawingCatalog/UI/DrawingCatalogView.cs

@@ -62,9 +62,6 @@ namespace Darkmatter.Features.DrawingCatalog
             while (_buttons.Count < items.Count)
             {
                 var button = Instantiate(buttonPrefab, content);
-                var item = items[_buttons.Count];
-                button.Initialize(item.Id, item.Thumbnail,
-                    () => { OnItemClicked?.Invoke(item.Id); });
                 _buttons.Add(button);
             }
 
@@ -75,6 +72,13 @@ namespace Darkmatter.Features.DrawingCatalog
                 Destroy(last.gameObject);
             }
 
+            for (var i = 0; i < items.Count; i++)
+            {
+                var item = items[i];
+                _buttons[i].Initialize(item.Id, item.Thumbnail,
+                    () => { OnItemClicked?.Invoke(item.Id); });
+            }
+
             LayoutRebuilder.ForceRebuildLayoutImmediate(content);
         }
 
@@ -178,4 +182,4 @@ namespace Darkmatter.Features.DrawingCatalog
             _suppressScrollEvents = false;
         }
     }
-}
+}

Assets/Darkmatter/Code/Features/DrawingTemplate/Editor/DrawingTemplateEditorWindow.cs

@@ -68,7 +68,9 @@ namespace Darkmatter.Features.DrawingTemplates.Editor
             _templates.Clear();
             _shapes.Clear();
             _palettes.Clear();
-            _templates.AddRange(FindAllOfType<DrawingTemplateSO>());
+            _templates.AddRange(FindAllOfType<DrawingTemplateSO>()
+                .OrderBy(t => t.Difficulty)
+                .ThenBy(t => t.Id, StringComparer.OrdinalIgnoreCase));
             _shapes.AddRange(FindAllOfType<ShapeSO>());
             _palettes.AddRange(FindAllOfType<ColorPaletteSO>());
         }
@@ -169,7 +171,7 @@ namespace Darkmatter.Features.DrawingTemplates.Editor
                 using (new EditorGUILayout.VerticalScope())
                 {
                     GUILayout.Label(string.IsNullOrEmpty(t.DisplayName) ? t.name : t.DisplayName, EditorStyles.boldLabel);
-                    GUILayout.Label("id: " + (string.IsNullOrEmpty(t.Id) ? "<unset>" : t.Id), EditorStyles.miniLabel);
+                    GUILayout.Label($"id: {(string.IsNullOrEmpty(t.Id) ? "<unset>" : t.Id)}  •  diff: {t.Difficulty}{(t.HasDifficultyOverride ? "*" : $" ({t.Pieces.Count}p+{t.AuthoredRegions.Count}r)")}", EditorStyles.miniLabel);
                 }
                 if (GUILayout.Button("Select", GUILayout.Width(54)))
                     Select(t);
@@ -206,8 +208,20 @@ namespace Darkmatter.Features.DrawingTemplates.Editor
                 EditorGUILayout.LabelField("Basics", EditorStyles.boldLabel);
                 EditorGUILayout.PropertyField(so.FindProperty("id"), new GUIContent("Id (Addressable Key)"));
                 EditorGUILayout.PropertyField(so.FindProperty("displayName"));
+                EditorGUILayout.PropertyField(so.FindProperty("difficultyOverride"),
+                    new GUIContent("Difficulty Override", "0 = auto (pieces + regions). Any positive value overrides."));
+                EditorGUILayout.LabelField(
+                    new GUIContent("Difficulty (effective)", "Sorts the catalog, lowest first."),
+                    new GUIContent(t.HasDifficultyOverride
+                        ? $"{t.Difficulty}  (override; auto would be {t.AutoDifficulty})"
+                        : $"{t.Difficulty}  (auto: {t.Pieces.Count} pieces + {t.AuthoredRegions.Count} regions)"));
                 EditorGUILayout.PropertyField(so.FindProperty("defaultThumbnail"));
 
+                EditorGUILayout.Space(6);
+                EditorGUILayout.LabelField("Sound", EditorStyles.boldLabel);
+                EditorGUILayout.PropertyField(so.FindProperty("completionSound"),
+                    new GUIContent("Completion Sound (MP3)", "Audio clip (e.g. an imported .mp3) played in sync with the completion animation."));
+
                 EditorGUILayout.Space(6);
                 EditorGUILayout.LabelField("Prefabs", EditorStyles.boldLabel);
                 EditorGUILayout.PropertyField(so.FindProperty("drawingPrefab"), new GUIContent("Drawing Prefab (SlotMarkers)"));
@@ -232,7 +246,7 @@ namespace Darkmatter.Features.DrawingTemplates.Editor
                         Undo.RecordObject(t, "Clear Pieces");
                         var emptyPieces = new List<ShapeSO>();
                         t.EditorSet(t.Id, t.DisplayName, t.DefaultThumbnail, t.DrawingPrefab, t.ColoringPrefab,
-                            t.CompletionAnimationPrefab, emptyPieces, t.AuthoredRegions.ToList(), t.ColorPaletteId);
+                            t.CompletionAnimationPrefab, t.CompletionSound, emptyPieces, t.AuthoredRegions.ToList(), t.ColorPaletteId);
                         EditorUtility.SetDirty(t);
                         so.Update();
                     }
@@ -264,7 +278,7 @@ namespace Darkmatter.Features.DrawingTemplates.Editor
                     {
                         Undo.RecordObject(t, "Clear Regions");
                         t.EditorSet(t.Id, t.DisplayName, t.DefaultThumbnail, t.DrawingPrefab, t.ColoringPrefab,
-                            t.CompletionAnimationPrefab, t.Pieces.ToList(), new List<RegionAuthoring>(), t.ColorPaletteId);
+                            t.CompletionAnimationPrefab, t.CompletionSound, t.Pieces.ToList(), new List<RegionAuthoring>(), t.ColorPaletteId);
                         EditorUtility.SetDirty(t);
                         so.Update();
                     }
@@ -332,7 +346,7 @@ namespace Darkmatter.Features.DrawingTemplates.Editor
                 }
                 Undo.RecordObject(t, "Scan Drawing Prefab");
                 t.EditorSet(t.Id, t.DisplayName, t.DefaultThumbnail, t.DrawingPrefab, t.ColoringPrefab,
-                    t.CompletionAnimationPrefab, pieces, t.AuthoredRegions.ToList(), t.ColorPaletteId);
+                    t.CompletionAnimationPrefab, t.CompletionSound, pieces, t.AuthoredRegions.ToList(), t.ColorPaletteId);
                 EditorUtility.SetDirty(t);
                 _lastScanReport = $"Found {markers.Length} SlotMarker(s), {pieces.Count} unique ShapeSO. {missing} marker(s) had no ShapeSO assigned.";
                 Validate();
@@ -412,7 +426,7 @@ namespace Darkmatter.Features.DrawingTemplates.Editor
 
                 Undo.RecordObject(t, "Scan Coloring Prefab");
                 t.EditorSet(t.Id, t.DisplayName, t.DefaultThumbnail, t.DrawingPrefab, t.ColoringPrefab,
-                    t.CompletionAnimationPrefab, t.Pieces.ToList(), regions, t.ColorPaletteId);
+                    t.CompletionAnimationPrefab, t.CompletionSound, t.Pieces.ToList(), regions, t.ColorPaletteId);
                 EditorUtility.SetDirty(t);
 
                 var report = new System.Text.StringBuilder();
@@ -612,7 +626,7 @@ namespace Darkmatter.Features.DrawingTemplates.Editor
             if (string.IsNullOrEmpty(path)) return;
             var t = CreateInstance<DrawingTemplateSO>();
             var name = Path.GetFileNameWithoutExtension(path);
-            t.EditorSet(name, name, null, null, null, null, new List<ShapeSO>(), new List<RegionAuthoring>(), "defaultPalette");
+            t.EditorSet(name, name, null, null, null, null, null, new List<ShapeSO>(), new List<RegionAuthoring>(), "defaultPalette");
             AssetDatabase.CreateAsset(t, path);
             AssetDatabase.SaveAssets();
             Refresh();

Assets/Darkmatter/Code/Features/DrawingTemplate/Systems/AddressableDrawingTemplateCatalog.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Threading;
 using Cysharp.Threading.Tasks;
@@ -48,11 +49,11 @@ namespace Darkmatter.Features.DrawingTemplates.Systems
                 _byId[t.Id] = t;
             }
 
-            _allIds.Sort();
+            SortIds();
             _initialized = true;
         }
 
-        public async UniTask<Sprite> GetThumbnailAsync(string id)
+        public async UniTask<(Sprite sprite, bool owned)> GetThumbnailAsync(string id)
         {
             if (!_byId.TryGetValue(id, out var t))
                 throw new KeyNotFoundException($"Template '{id}' not in catalog. Did InitializeAsync run?");
@@ -61,9 +62,9 @@ namespace Darkmatter.Features.DrawingTemplates.Systems
             if (savedTex != null)
             {
                 var rect = new Rect(0, 0, savedTex.width, savedTex.height);
-                return Sprite.Create(savedTex, rect, new Vector2(0.5f, 0.5f));
+                return (Sprite.Create(savedTex, rect, new Vector2(0.5f, 0.5f)), true);
             }
-            return t.DefaultThumbnail;
+            return (t.DefaultThumbnail, false);
         }
 
         public UniTask<IDrawingTemplate> LoadAsync(string id)
@@ -84,12 +85,22 @@ namespace Darkmatter.Features.DrawingTemplates.Systems
             if (!_allIds.Contains(id))
             {
                 _allIds.Add(id);
-                _allIds.Sort();
+                SortIds();
             }
 
             return t;
         }
 
+        // Easiest drawings first; ties broken by id so the order is stable.
+        private void SortIds()
+        {
+            _allIds.Sort((a, b) =>
+            {
+                var byDifficulty = _byId[a].Difficulty.CompareTo(_byId[b].Difficulty);
+                return byDifficulty != 0 ? byDifficulty : string.Compare(a, b, StringComparison.OrdinalIgnoreCase);
+            });
+        }
+
         public void ReleaseAll()
         {
             if (!_initialized) return;

Assets/Darkmatter/Code/Features/GameplayFlow/Systems/GameplayFlowController.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Threading;
 using Cysharp.Threading.Tasks;
+using Darkmatter.Core;
 using Darkmatter.Core.Contracts.Features.Capture;
 using Darkmatter.Core.Contracts.Features.Coloring;
 using Darkmatter.Core.Contracts.Features.DrawingCatalog;
@@ -28,6 +29,7 @@ namespace Darkmatter.Features.GameplayFlow.Systems
     public sealed class GameplayFlowController : IAsyncStartable, IGameplayFlowController, IDisposable
     {
         private const int AutosaveDebounceMs = 500;
+        private const float ThumbnailMinIntervalSec = 30f;
 
         private readonly IProgressionSystem _progression;
         private readonly IDrawingTemplateCatalog _catalog;
@@ -44,10 +46,13 @@ namespace Darkmatter.Features.GameplayFlow.Systems
         private string _templateId;
         private DrawingPhase _phase = DrawingPhase.ShapeBuilding;
         private bool _allContentReported;
+        private bool _navigating;
+        private float _lastThumbnailTime = float.NegativeInfinity;
 
         private IDisposable _assembledSub;
         private IDisposable _colorAppliedSub;
         private IDisposable _drawingSelectedSub;
+        private IDisposable _openColorbookSub;
         private CancellationTokenSource _autosaveCts;
         private CancellationTokenSource _scopeCts;
 
@@ -76,6 +81,27 @@ namespace Darkmatter.Features.GameplayFlow.Systems
         }
 
         public async UniTask StartAsync(CancellationToken cancellation)
+        {
+            try
+            {
+                await StartCoreAsync(cancellation);
+            }
+            catch (OperationCanceledException)
+            {
+                // Scene torn down mid-init; nothing to recover.
+            }
+            catch (Exception e)
+            {
+                // Any throw here (missing template id, failed Addressables load, region init)
+                // would otherwise skip _loadingScreen.Hide() and strand the kid on a frozen
+                // loader forever. Log it and route back to the Colorbook, whose flow hides the
+                // loading screen once its catalog is populated.
+                Debug.LogError($"[GameplayFlow] Failed to start gameplay, returning to Colorbook: {e}");
+                await RecoverToColorbookAsync();
+            }
+        }
+
+        private async UniTask StartCoreAsync(CancellationToken cancellation)
         {
             _scopeCts = CancellationTokenSource.CreateLinkedTokenSource(cancellation);
             var ct = _scopeCts.Token;
@@ -104,6 +130,10 @@ namespace Darkmatter.Features.GameplayFlow.Systems
             _assembledSub = _bus.Subscribe<ShapeAssembledSignal>(OnShapeAssembled);
             _colorAppliedSub = _bus.Subscribe<ColorAppliedSignal>(OnColorApplied);
             _drawingSelectedSub = _bus.Subscribe<DrawingSelectedSignal>(OnDrawingSelected);
+            // The art book's "colorbook" button publishes OpenColorBookSignal. In the Colorbook
+            // scene DrawingCatalogPresenter shows the catalog; during gameplay that presenter is
+            // dead, so treat the signal as "leave gameplay for the colorbook" (same as back).
+            _openColorbookSub = _bus.Subscribe<OpenColorBookSignal>(OnOpenColorBook);
 
             _loadingScreen.SetProgress(1f);
             if (_phase == DrawingPhase.Coloring)
@@ -119,66 +149,96 @@ namespace Darkmatter.Features.GameplayFlow.Systems
             _loadingScreen.Hide();
         }
 
+        private async UniTask RecoverToColorbookAsync()
+        {
+            try
+            {
+                _shapeBuilder.Clear();
+                _coloring.Clear();
+                await _scenes.LoadSceneAsync(nameof(GameScene.Colorbook), progress: null, cancellationToken: default);
+                await _scenes.UnloadSceneAsync(nameof(GameScene.Gameplay), progress: null, cancellationToken: default);
+            }
+            catch (Exception e)
+            {
+                Debug.LogError($"[GameplayFlow] Recovery to Colorbook failed: {e}");
+                _loadingScreen.Hide();
+            }
+        }
+
         public async UniTask BackAsync(CancellationToken ct)
         {
-            await SaveCurrentAsync(CancellationToken.None);
+            // A second navigation while one runs (e.g. Back pressed during the completion
-            _loadingScreen.Show();
+            // animation inside NextAsync) would interleave two saves and two Colorbook loads,
-            _shapeBuilder.Clear();
+            // and Clear() would rip the celebration apart mid-flight. First navigation wins.
-            _coloring.Clear();
+            if (_navigating) return;
-            await _scenes.LoadSceneAsync(nameof(GameScene.Colorbook), progress: null, cancellationToken: ct);
+            _navigating = true;
-            await _scenes.UnloadSceneAsync(nameof(GameScene.Gameplay), progress: null, cancellationToken: ct);
+            try
+            {
+                await SaveCurrentAsync(CancellationToken.None);
+                _loadingScreen.Show();
+                _shapeBuilder.Clear();
+                _coloring.Clear();
+                await _scenes.LoadSceneAsync(nameof(GameScene.Colorbook), progress: null, cancellationToken: ct);
+                await _scenes.UnloadSceneAsync(nameof(GameScene.Gameplay), progress: null, cancellationToken: ct);
+            }
+            finally
+            {
+                _navigating = false;
+            }
         }
 
         public async UniTask SaveAsync(CancellationToken ct)
         {
-            await SaveCurrentAsync(ct);
+            // One capture serves both the gallery write and the progress thumbnail — this used to
-            await _capture.CapturePngAsync(saveToGallery: true, ct);
+            // run the full capture pipeline twice back to back.
+            var png = await _capture.CapturePngAsync(saveToGallery: true, ct);
+            await SaveCurrentAsync(ct, captureThumbnail: false, precapturedThumbnail: png);
         }
 
         public async UniTask NextAsync(CancellationToken ct)
         {
-            // Drop any debounced autosave so it can't fire during/after the completion
+            if (_navigating) return;
-            // animation and capture the animation (or an empty paper) into the thumbnail.
+            _navigating = true;
-            _autosaveCts?.Cancel();
+            try
-            _autosaveCts?.Dispose();
-            _autosaveCts = null;
-
-            await SaveCurrentAsync(ct);
-            _refs.Confetti.Play();
-            _sfx.Play(SfxId.FireWorkLaunch);
-            _sfx.Play(SfxId.LevelComplete);
-            await _coloring.PlayCompletionAnimationAsync(ct);
-            _progression.MarkCompleted(_templateId);
-            var progressAfter = _progression.GetProgress(_templateId);
-            _bus.Publish(new DrawingCompletedSignal(_templateId, progressAfter?.completionCount ?? 1));
-
-            // Player has cleared the whole catalog → surface the "ran out of content" milestone. Guarded
-            // per session here; analytics dedupes it to once-ever.
-            if (!_allContentReported &&
-                _catalog.AllTemplateIds.Count > 0 &&
-                _progression.CompletedTemplateIds.Count >= _catalog.AllTemplateIds.Count)
             {
-                _allContentReported = true;
+                // Drop any debounced autosave so it can't fire during/after the completion
-                _bus.Publish(new AllContentCompletedSignal(_progression.CompletedTemplateIds.Count));
+                // animation and capture the animation (or an empty paper) into the thumbnail.
-            }
+                _autosaveCts?.Cancel();
+                _autosaveCts?.Dispose();
+                _autosaveCts = null;
 
-            var nextId = _catalog.GetNextTemplate(_templateId);
+                await SaveCurrentAsync(ct);
-            if (string.IsNullOrEmpty(nextId))
+                _refs.Confetti.Play();
-            {
+                _sfx.Play(SfxId.FireWorkLaunch);
+                _sfx.Play(SfxId.LevelComplete);
+                await _coloring.PlayCompletionAnimationAsync(ct);
+                _progression.MarkCompleted(_templateId);
+                var progressAfter = _progression.GetProgress(_templateId);
+                _bus.Publish(new DrawingCompletedSignal(_templateId, progressAfter?.completionCount ?? 1));
+
+                // Player has cleared the whole catalog → surface the "ran out of content" milestone. Guarded
+                // per session here; analytics dedupes it to once-ever.
+                if (!_allContentReported &&
+                    _catalog.AllTemplateIds.Count > 0 &&
+                    _progression.CompletedTemplateIds.Count >= _catalog.AllTemplateIds.Count)
+                {
+                    _allContentReported = true;
+                    _bus.Publish(new AllContentCompletedSignal(_progression.CompletedTemplateIds.Count));
+                }
+
+                var nextId = _catalog.GetNextTemplate(_templateId);
                 _loadingScreen.Show();
                 _shapeBuilder.Clear();
                 _coloring.Clear();
                 await _scenes.LoadSceneAsync(nameof(GameScene.Colorbook), progress: null, cancellationToken: default);
                 await _scenes.UnloadSceneAsync(nameof(GameScene.Gameplay), progress: null, cancellationToken: default);
-                return;
+                if (!string.IsNullOrEmpty(nextId))
+                    _bus.Publish(new DrawingSelectedSignal(nextId));
+            }
+            finally
+            {
+                _navigating = false;
             }
-
-            _loadingScreen.Show();
-            _shapeBuilder.Clear();
-            _coloring.Clear();
-            await _scenes.LoadSceneAsync(nameof(GameScene.Colorbook), progress: null, cancellationToken: default);
-            await _scenes.UnloadSceneAsync(nameof(GameScene.Gameplay), progress: null, cancellationToken: default);
-            _bus.Publish(new DrawingSelectedSignal(nextId));
         }
         
         
@@ -209,6 +269,11 @@ namespace Darkmatter.Features.GameplayFlow.Systems
             DebouncedAutosaveAsync(_autosaveCts.Token).Forget();
         }
 
+        private void OnOpenColorBook(OpenColorBookSignal _)
+        {
+            BackAsync(CancellationToken.None).Forget();
+        }
+
         private void OnDrawingSelected(DrawingSelectedSignal signal)
         {
             if (string.IsNullOrEmpty(signal.TemplateId)) return;
@@ -218,13 +283,22 @@ namespace Darkmatter.Features.GameplayFlow.Systems
 
         private async UniTaskVoid EditAsync(string newTemplateId)
         {
-            await SaveCurrentAsync(CancellationToken.None);
+            if (_navigating) return;
-            _loadingScreen.Show();
+            _navigating = true;
-            _shapeBuilder.Clear();
+            try
-            _coloring.Clear();
+            {
-            await _scenes.LoadSceneAsync(nameof(GameScene.Colorbook), progress: null, cancellationToken: default);
+                await SaveCurrentAsync(CancellationToken.None);
-            await _scenes.UnloadSceneAsync(nameof(GameScene.Gameplay), progress: null, cancellationToken: default);
+                _loadingScreen.Show();
-            _bus.Publish(new DrawingSelectedSignal(newTemplateId));
+                _shapeBuilder.Clear();
+                _coloring.Clear();
+                await _scenes.LoadSceneAsync(nameof(GameScene.Colorbook), progress: null, cancellationToken: default);
+                await _scenes.UnloadSceneAsync(nameof(GameScene.Gameplay), progress: null, cancellationToken: default);
+                _bus.Publish(new DrawingSelectedSignal(newTemplateId));
+            }
+            finally
+            {
+                _navigating = false;
+            }
         }
 
         private async UniTaskVoid DebouncedAutosaveAsync(CancellationToken ct)
@@ -232,7 +306,13 @@ namespace Darkmatter.Features.GameplayFlow.Systems
             try
             {
                 await UniTask.Delay(AutosaveDebounceMs, cancellationToken: ct);
-                await SaveCurrentAsync(ct);
+                // Autosaves fire after every paint pause; capturing a thumbnail each time renders the
+                // scene to an RT and PNG-encodes it, which OOM-kills long sessions on low-RAM devices.
+                // Colors always persist; the thumbnail refreshes at most every ThumbnailMinIntervalSec
+                // here and unconditionally on the exit paths (back / next / select-away).
+                bool refreshThumbnail =
+                    Time.realtimeSinceStartup - _lastThumbnailTime >= ThumbnailMinIntervalSec;
+                await SaveCurrentAsync(ct, captureThumbnail: refreshThumbnail);
             }
             catch (OperationCanceledException)
             {
@@ -240,7 +320,8 @@ namespace Darkmatter.Features.GameplayFlow.Systems
             }
         }
 
-        private async UniTask SaveCurrentAsync(CancellationToken ct)
+        private async UniTask SaveCurrentAsync(CancellationToken ct, bool captureThumbnail = true,
+            byte[] precapturedThumbnail = null)
         {
             if (string.IsNullOrEmpty(_templateId)) return;
 
@@ -263,7 +344,10 @@ namespace Darkmatter.Features.GameplayFlow.Systems
                 FirstCompletedUtc = existing?.FirstCompletedUtc,
             };
 
-            var thumbnailPng = await _capture.CapturePngAsync(saveToGallery: false, ct);
+            byte[] thumbnailPng = precapturedThumbnail;
+            if (thumbnailPng == null && captureThumbnail)
+                thumbnailPng = await _capture.CapturePngAsync(saveToGallery: false, ct);
+            if (thumbnailPng != null) _lastThumbnailTime = Time.realtimeSinceStartup;
 
             await _progression.SaveProgressAsync(progress, thumbnailPng);
         }
@@ -284,6 +368,7 @@ namespace Darkmatter.Features.GameplayFlow.Systems
             _assembledSub?.Dispose();
             _colorAppliedSub?.Dispose();
             _drawingSelectedSub?.Dispose();
+            _openColorbookSub?.Dispose();
             _autosaveCts?.Cancel();
             _autosaveCts?.Dispose();
             _scopeCts?.Cancel();

Assets/Darkmatter/Code/Features/ImageCombiner.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 000c0b9528ead0b43af7cdc19fb38f0e
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Darkmatter/Code/Features/ImageCombiner/Editor.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 932d925aaafb08242b1fd65d3860ef40
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Darkmatter/Code/Features/ImageCombiner/Editor/Features.ImageCombiner.Editor.asmdef

@@ -0,0 +1,18 @@
+{
+    "name": "Features.ImageCombiner.Editor",
+    "rootNamespace": "Darkmatter.Features.ImageCombiner.Editor",
+    "references": [
+        "GUID:bcae41f3415403d4da1f7aafb6d9a728"
+    ],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

Assets/Darkmatter/Code/Features/ImageCombiner/Editor/Features.ImageCombiner.Editor.asmdef.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: cba93615156299e4482e6b41e7db0199
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Darkmatter/Code/Features/ImageCombiner/Editor/UIImageCombinerEditor.cs

@@ -0,0 +1,633 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using UnityEditor;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Darkmatter.Features.ImageCombiner.Editor
+{
+    /// <summary>
+    /// Custom inspector for <see cref="UIImageCombiner"/>. Draws the configuration (save folder,
+    /// the two "after combining" checkboxes, resolution options) and performs the actual flatten:
+    /// it composites every child Image into one texture that matches the children's combined
+    /// bounds / position / aspect ratio, writes it as a PNG and (optionally) assigns it back.
+    /// </summary>
+    [CustomEditor(typeof(UIImageCombiner))]
+    public sealed class UIImageCombinerEditor : UnityEditor.Editor
+    {
+        private SerializedProperty _saveFolder;
+        private SerializedProperty _fileName;
+        private SerializedProperty _destroyChildren;
+        private SerializedProperty _disableChildren;
+        private SerializedProperty _recurse;
+        private SerializedProperty _includeInactive;
+        private SerializedProperty _pixelsPerUnit;
+        private SerializedProperty _maxDimension;
+        private SerializedProperty _trimTransparent;
+        private SerializedProperty _alphaThreshold;
+        private SerializedProperty _assignToSelf;
+
+        /// <summary>Relative aspect-ratio difference above which a stretched child is reported.</summary>
+        private const float AspectMismatchTolerance = 0.01f;
+
+        private void OnEnable()
+        {
+            _saveFolder = serializedObject.FindProperty("_saveFolder");
+            _fileName = serializedObject.FindProperty("_fileName");
+            _destroyChildren = serializedObject.FindProperty("_destroyChildrenAfterCombine");
+            _disableChildren = serializedObject.FindProperty("_disableChildrenAfterCombine");
+            _recurse = serializedObject.FindProperty("_recurseIntoChildren");
+            _includeInactive = serializedObject.FindProperty("_includeInactiveChildren");
+            _pixelsPerUnit = serializedObject.FindProperty("_pixelsPerUnit");
+            _maxDimension = serializedObject.FindProperty("_maxDimension");
+            _trimTransparent = serializedObject.FindProperty("_trimTransparent");
+            _alphaThreshold = serializedObject.FindProperty("_alphaThreshold");
+            _assignToSelf = serializedObject.FindProperty("_assignCombinedToSelf");
+        }
+
+        public override void OnInspectorGUI()
+        {
+            serializedObject.Update();
+
+            var combiner = (UIImageCombiner)target;
+
+            EditorGUILayout.LabelField("Output location", EditorStyles.boldLabel);
+            using (new EditorGUILayout.HorizontalScope())
+            {
+                EditorGUILayout.PropertyField(_saveFolder, new GUIContent("Save Folder"));
+                if (GUILayout.Button("Browse", GUILayout.Width(64)))
+                    BrowseForFolder(_saveFolder);
+            }
+            EditorGUILayout.PropertyField(_fileName, new GUIContent("File Name (opt.)"));
+
+            EditorGUILayout.Space(6);
+            EditorGUILayout.LabelField("After combining", EditorStyles.boldLabel);
+            EditorGUILayout.PropertyField(_destroyChildren, new GUIContent("Destroy Children"));
+            using (new EditorGUI.DisabledScope(_destroyChildren.boolValue))
+                EditorGUILayout.PropertyField(_disableChildren, new GUIContent("Disable Children"));
+            if (_destroyChildren.boolValue && _disableChildren.boolValue)
+                EditorGUILayout.HelpBox("Both ticked: children will be destroyed (destroy wins).", MessageType.Info);
+
+            EditorGUILayout.Space(6);
+            EditorGUILayout.LabelField("What to combine", EditorStyles.boldLabel);
+            EditorGUILayout.PropertyField(_recurse, new GUIContent("Recurse Into Children"));
+            EditorGUILayout.PropertyField(_includeInactive, new GUIContent("Include Inactive"));
+
+            EditorGUILayout.Space(6);
+            EditorGUILayout.LabelField("Resolution", EditorStyles.boldLabel);
+            EditorGUILayout.PropertyField(_pixelsPerUnit, new GUIContent("Pixels Per Unit (0 = auto)"));
+            EditorGUILayout.PropertyField(_maxDimension, new GUIContent("Max Dimension"));
+
+            EditorGUILayout.Space(6);
+            EditorGUILayout.LabelField("Trimming", EditorStyles.boldLabel);
+            EditorGUILayout.PropertyField(_trimTransparent, new GUIContent("Trim Transparent"));
+            using (new EditorGUI.DisabledScope(!_trimTransparent.boolValue))
+                EditorGUILayout.PropertyField(_alphaThreshold, new GUIContent("Alpha Threshold"));
+
+            EditorGUILayout.Space(6);
+            EditorGUILayout.LabelField("Assignment", EditorStyles.boldLabel);
+            EditorGUILayout.PropertyField(_assignToSelf, new GUIContent("Assign Combined To Self"));
+
+            serializedObject.ApplyModifiedProperties();
+
+            EditorGUILayout.Space(10);
+            using (new EditorGUI.DisabledScope(Application.isPlaying))
+            {
+                if (GUILayout.Button("Combine Images", GUILayout.Height(32)))
+                    Combine(combiner);
+            }
+            if (Application.isPlaying)
+                EditorGUILayout.HelpBox("Exit play mode to combine images.", MessageType.Warning);
+        }
+
+        private static void BrowseForFolder(SerializedProperty folderProp)
+        {
+            string start = folderProp.stringValue;
+            if (string.IsNullOrEmpty(start)) start = "Assets";
+            string abs = EditorUtility.OpenFolderPanel("Choose save folder", start, "");
+            if (string.IsNullOrEmpty(abs)) return;
+
+            // Convert to a project-relative "Assets/..." path when the chosen folder is inside the project.
+            string dataPath = Application.dataPath.Replace('\\', '/');
+            abs = abs.Replace('\\', '/');
+            if (abs == dataPath)
+                folderProp.stringValue = "Assets";
+            else if (abs.StartsWith(dataPath + "/"))
+                folderProp.stringValue = "Assets" + abs.Substring(dataPath.Length);
+            else
+                folderProp.stringValue = abs; // outside the project – keep the absolute path
+            folderProp.serializedObject.ApplyModifiedProperties();
+        }
+
+        // ------------------------------------------------------------------ combine
+
+        private static void Combine(UIImageCombiner combiner)
+        {
+            var self = (RectTransform)combiner.transform;
+
+            var images = CollectImages(combiner, self);
+            if (images.Count == 0)
+            {
+                EditorUtility.DisplayDialog("UI Image Combiner",
+                    "No child Image components found to combine.", "OK");
+                return;
+            }
+
+            // 1) Combined world bounds from every child's rect corners.
+            if (!TryComputeBounds(images, out Vector2 boundsMin, out Vector2 boundsMax))
+            {
+                EditorUtility.DisplayDialog("UI Image Combiner",
+                    "The combined bounds are empty (zero size).", "OK");
+                return;
+            }
+            Vector2 boundsSize = boundsMax - boundsMin;
+
+            // 2) Output resolution.
+            float ppu = combiner.PixelsPerUnit > 0f
+                ? combiner.PixelsPerUnit
+                : AutoPixelsPerUnit(images);
+            int width = Mathf.Max(1, Mathf.RoundToInt(boundsSize.x * ppu));
+            int height = Mathf.Max(1, Mathf.RoundToInt(boundsSize.y * ppu));
+            int maxDim = combiner.MaxDimension;
+            int longest = Mathf.Max(width, height);
+            if (longest > maxDim)
+            {
+                float s = maxDim / (float)longest;
+                width = Mathf.Max(1, Mathf.RoundToInt(width * s));
+                height = Mathf.Max(1, Mathf.RoundToInt(height * s));
+            }
+
+            bool rotationWarned = false;
+            var pixelCache = new Dictionary<Texture, (Color32[] px, int w, int h)>();
+            var output = new Color[width * height]; // straight alpha, (0,0) = bottom-left
+            float worldPerPxX = boundsSize.x / width;
+            float worldPerPxY = boundsSize.y / height;
+
+            try
+            {
+                for (int i = 0; i < images.Count; i++)
+                {
+                    Image img = images[i];
+                    EditorUtility.DisplayProgressBar("UI Image Combiner",
+                        $"Compositing {img.name} ({i + 1}/{images.Count})", (i + 1f) / images.Count);
+
+                    if (!TryGetAxisAlignedRect(img, out Vector2 imgMin, out Vector2 imgMax, out bool rotated))
+                        continue;
+                    if (rotated && !rotationWarned)
+                    {
+                        Debug.LogWarning("[UIImageCombiner] One or more images are rotated/skewed; " +
+                                         "they are composited using their axis-aligned bounds and may " +
+                                         "look distorted.", img);
+                        rotationWarned = true;
+                    }
+
+                    Color tint = img.color;
+                    Sprite sprite = img.sprite;
+
+                    // Rect the sprite is actually drawn into (accounts for Preserve Aspect).
+                    Vector2 drawMin = imgMin;
+                    Vector2 drawSize = imgMax - imgMin;
+                    if (sprite != null && drawSize.x > 0f && drawSize.y > 0f)
+                    {
+                        if (img.preserveAspect)
+                        {
+                            FitPreserveAspect(sprite, ref drawMin, ref drawSize);
+                        }
+                        else if (sprite.rect.height > 0f)
+                        {
+                            // Preserve Aspect is off, so the whole sprite is stretched to fill the
+                            // RectTransform. If their aspect ratios differ, the content (and any
+                            // transparent padding) gets squashed/stretched — warn and name the child.
+                            float spriteAspect = sprite.rect.width / sprite.rect.height;
+                            float rectAspect = drawSize.x / drawSize.y;
+                            if (spriteAspect > 0f &&
+                                Mathf.Abs(rectAspect - spriteAspect) > spriteAspect * AspectMismatchTolerance)
+                            {
+                                Debug.LogWarning(
+                                    $"[UIImageCombiner] \"{img.name}\" will be stretched: sprite is " +
+                                    $"{sprite.rect.width:0}x{sprite.rect.height:0} (aspect {spriteAspect:0.###}) " +
+                                    $"but its RectTransform aspect is {rectAspect:0.###} and Preserve Aspect is " +
+                                    "off. Enable \"Preserve Aspect\" on the Image, or match the RectTransform to " +
+                                    "the sprite's aspect ratio, to avoid distortion.", img);
+                            }
+                        }
+                    }
+
+                    // A trimmed / tight-mesh sprite reports its FULL frame as sprite.rect but only
+                    // draws the opaque texels described by GetOuterUV. A UI Image maps that outer UV
+                    // onto the padding-inset sub-rect of its RectTransform and leaves the transparent
+                    // border empty — it does NOT stretch the artwork to fill the frame. Shrink the draw
+                    // rect to that same sub-rect so each child keeps its real size/position and only its
+                    // visible pixels are composited (the transparent background is dropped).
+                    if (sprite != null && drawSize.x > 0f && drawSize.y > 0f)
+                        InsetBySpritePadding(sprite, ref drawMin, ref drawSize);
+
+                    if (drawSize.x <= 0f || drawSize.y <= 0f)
+                        continue;
+
+                    (Color32[] px, int tw, int th) src = default;
+                    Rect texRect = default;
+                    if (sprite != null)
+                    {
+                        src = GetPixels(sprite.texture, pixelCache);
+                        // Use the sprite's OUTER UV rect (the full quad, transparent padding
+                        // included) — the same region a UI Image maps onto its RectTransform when
+                        // "Use Sprite Mesh" is off. sprite.textureRect is the tight, transparent-
+                        // trimmed rect (Sprite Mesh Type = Tight), which would map only the drawn
+                        // pixels across the whole rect and stretch the artwork to fill it.
+                        Vector4 uv = UnityEngine.Sprites.DataUtility.GetOuterUV(sprite);
+                        texRect = new Rect(uv.x * src.tw, uv.y * src.th,
+                                           (uv.z - uv.x) * src.tw, (uv.w - uv.y) * src.th);
+                    }
+
+                    // Pixel range this image can touch.
+                    int px0 = Mathf.Clamp(Mathf.FloorToInt((drawMin.x - boundsMin.x) / worldPerPxX), 0, width);
+                    int px1 = Mathf.Clamp(Mathf.CeilToInt((drawMin.x + drawSize.x - boundsMin.x) / worldPerPxX), 0, width);
+                    int py0 = Mathf.Clamp(Mathf.FloorToInt((drawMin.y - boundsMin.y) / worldPerPxY), 0, height);
+                    int py1 = Mathf.Clamp(Mathf.CeilToInt((drawMin.y + drawSize.y - boundsMin.y) / worldPerPxY), 0, height);
+
+                    for (int y = py0; y < py1; y++)
+                    {
+                        float worldY = boundsMin.y + (y + 0.5f) * worldPerPxY;
+                        float v = (worldY - drawMin.y) / drawSize.y;
+                        if (v < 0f || v > 1f) continue;
+                        int row = y * width;
+
+                        for (int x = px0; x < px1; x++)
+                        {
+                            float worldX = boundsMin.x + (x + 0.5f) * worldPerPxX;
+                            float u = (worldX - drawMin.x) / drawSize.x;
+                            if (u < 0f || u > 1f) continue;
+
+                            Color srcColor;
+                            if (sprite != null)
+                            {
+                                float texPx = texRect.x + u * texRect.width;
+                                float texPy = texRect.y + v * texRect.height;
+                                srcColor = SampleBilinear(src.px, src.tw, src.th, texPx, texPy) * tint;
+                            }
+                            else
+                            {
+                                srcColor = tint; // Image with no sprite = solid colour quad.
+                            }
+
+                            if (srcColor.a <= 0f) continue;
+                            output[row + x] = Over(srcColor, output[row + x]);
+                        }
+                    }
+                }
+            }
+            finally
+            {
+                EditorUtility.ClearProgressBar();
+            }
+
+            // 2b) Alpha-trim: crop away transparent margins and shrink the bounds to the real content
+            //     so the output PNG (and the resized parent) tightly wrap the visible pixels.
+            if (combiner.TrimTransparent)
+            {
+                if (TryTrim(output, width, height, combiner.AlphaThreshold,
+                        out Color[] trimmed, out int tw, out int th,
+                        out int offsetX, out int offsetY))
+                {
+                    boundsMin = new Vector2(boundsMin.x + offsetX * worldPerPxX,
+                                            boundsMin.y + offsetY * worldPerPxY);
+                    boundsMax = new Vector2(boundsMin.x + tw * worldPerPxX,
+                                            boundsMin.y + th * worldPerPxY);
+                    boundsSize = boundsMax - boundsMin;
+                    output = trimmed;
+                    width = tw;
+                    height = th;
+                }
+                else
+                {
+                    Debug.LogWarning("[UIImageCombiner] The combined image is fully transparent; " +
+                                     "nothing to trim.", combiner);
+                }
+            }
+
+            // 3) Build the PNG.
+            var texture = new Texture2D(width, height, TextureFormat.RGBA32, false);
+            texture.SetPixels(output);
+            texture.Apply();
+            byte[] png = texture.EncodeToPNG();
+            Object.DestroyImmediate(texture);
+
+            // 4) Save it.
+            string relFolder = combiner.SaveFolder.Replace('\\', '/').TrimEnd('/');
+            if (string.IsNullOrEmpty(relFolder)) relFolder = "Assets";
+            string fileName = SanitizeFileName(combiner.FileName);
+            if (!fileName.EndsWith(".png", System.StringComparison.OrdinalIgnoreCase))
+                fileName += ".png";
+
+            string projectRoot = Directory.GetParent(Application.dataPath).FullName;
+            string absFolder = Path.IsPathRooted(relFolder)
+                ? relFolder
+                : Path.Combine(projectRoot, relFolder);
+            Directory.CreateDirectory(absFolder);
+            string absFile = Path.Combine(absFolder, fileName);
+            File.WriteAllBytes(absFile, png);
+
+            // 5) If it is inside the project, import as a Sprite and assign it back.
+            string assetPath = ToAssetPath(absFile, projectRoot);
+            Sprite combinedSprite = null;
+            if (assetPath != null)
+            {
+                AssetDatabase.ImportAsset(assetPath, ImportAssetOptions.ForceUpdate);
+                if (AssetImporter.GetAtPath(assetPath) is TextureImporter importer)
+                {
+                    importer.textureType = TextureImporterType.Sprite;
+                    importer.spriteImportMode = SpriteImportMode.Single;
+                    importer.alphaIsTransparency = true;
+                    importer.mipmapEnabled = false;
+                    importer.SaveAndReimport();
+                }
+                combinedSprite = AssetDatabase.LoadAssetAtPath<Sprite>(assetPath);
+            }
+
+            // 6) Assign to self + resize to the combined bounds.
+            Undo.RegisterFullObjectHierarchyUndo(self.gameObject, "Combine Images");
+            if (combiner.AssignCombinedToSelf && combinedSprite != null)
+            {
+                var image = self.GetComponent<Image>();
+                if (image == null) image = Undo.AddComponent<Image>(self.gameObject);
+                image.sprite = combinedSprite;
+                image.type = Image.Type.Simple;
+                image.preserveAspect = false;
+                image.color = Color.white;
+                image.enabled = true;
+
+                Vector3 lossy = self.lossyScale;
+                self.anchorMin = self.anchorMax = new Vector2(0.5f, 0.5f);
+                self.pivot = new Vector2(0.5f, 0.5f);
+                self.sizeDelta = new Vector2(
+                    boundsSize.x / (Mathf.Approximately(lossy.x, 0f) ? 1f : lossy.x),
+                    boundsSize.y / (Mathf.Approximately(lossy.y, 0f) ? 1f : lossy.y));
+                Vector2 center = (boundsMin + boundsMax) * 0.5f;
+                self.position = new Vector3(center.x, center.y, self.position.z);
+                EditorUtility.SetDirty(image);
+            }
+
+            // 7) Destroy or disable the combined children.
+            var childObjects = images.Select(im => im.gameObject).Distinct().ToList();
+            if (combiner.DestroyChildrenAfterCombine)
+            {
+                foreach (var go in childObjects)
+                    if (go != null && go != self.gameObject)
+                        Undo.DestroyObjectImmediate(go);
+            }
+            else if (combiner.DisableChildrenAfterCombine)
+            {
+                foreach (var go in childObjects)
+                    if (go != null && go != self.gameObject)
+                        go.SetActive(false);
+            }
+
+            EditorUtility.SetDirty(combiner);
+            if (!Application.isPlaying)
+                UnityEditor.SceneManagement.EditorSceneManager.MarkSceneDirty(combiner.gameObject.scene);
+
+            if (combinedSprite != null)
+            {
+                EditorGUIUtility.PingObject(combinedSprite);
+                Selection.activeObject = combinedSprite;
+            }
+            Debug.Log($"[UIImageCombiner] Combined {images.Count} image(s) into {width}x{height} " +
+                      $"PNG at \"{(assetPath ?? absFile)}\".", combiner);
+        }
+
+        // ------------------------------------------------------------------ helpers
+
+        private static List<Image> CollectImages(UIImageCombiner combiner, RectTransform self)
+        {
+            var result = new List<Image>();
+            if (combiner.RecurseIntoChildren)
+            {
+                // GetComponentsInChildren returns parent-first, depth-first (== UI draw order).
+                foreach (var img in self.GetComponentsInChildren<Image>(combiner.IncludeInactiveChildren))
+                {
+                    if (img.gameObject == self.gameObject) continue;
+                    if (!img.enabled) continue;
+                    result.Add(img);
+                }
+            }
+            else
+            {
+                for (int c = 0; c < self.childCount; c++)
+                {
+                    var child = self.GetChild(c);
+                    if (!combiner.IncludeInactiveChildren && !child.gameObject.activeInHierarchy) continue;
+                    var img = child.GetComponent<Image>();
+                    if (img != null && img.enabled) result.Add(img);
+                }
+            }
+            return result;
+        }
+
+        private static bool TryComputeBounds(List<Image> images, out Vector2 min, out Vector2 max)
+        {
+            min = new Vector2(float.MaxValue, float.MaxValue);
+            max = new Vector2(float.MinValue, float.MinValue);
+            var corners = new Vector3[4];
+            bool any = false;
+            foreach (var img in images)
+            {
+                ((RectTransform)img.transform).GetWorldCorners(corners);
+                for (int k = 0; k < 4; k++)
+                {
+                    min.x = Mathf.Min(min.x, corners[k].x);
+                    min.y = Mathf.Min(min.y, corners[k].y);
+                    max.x = Mathf.Max(max.x, corners[k].x);
+                    max.y = Mathf.Max(max.y, corners[k].y);
+                }
+                any = true;
+            }
+            return any && max.x > min.x && max.y > min.y;
+        }
+
+        /// <summary>
+        /// Finds the tight bounding box of pixels whose alpha exceeds <paramref name="threshold"/> and
+        /// returns a cropped copy plus the bottom-left offset (in pixels) of that box within the source.
+        /// </summary>
+        private static bool TryTrim(Color[] src, int width, int height, float threshold,
+            out Color[] cropped, out int newW, out int newH, out int offsetX, out int offsetY)
+        {
+            int minX = width, minY = height, maxX = -1, maxY = -1;
+            for (int y = 0; y < height; y++)
+            {
+                int row = y * width;
+                for (int x = 0; x < width; x++)
+                {
+                    if (src[row + x].a > threshold)
+                    {
+                        if (x < minX) minX = x;
+                        if (x > maxX) maxX = x;
+                        if (y < minY) minY = y;
+                        if (y > maxY) maxY = y;
+                    }
+                }
+            }
+
+            if (maxX < minX || maxY < minY)
+            {
+                cropped = null;
+                newW = newH = offsetX = offsetY = 0;
+                return false;
+            }
+
+            newW = maxX - minX + 1;
+            newH = maxY - minY + 1;
+            offsetX = minX;
+            offsetY = minY;
+            cropped = new Color[newW * newH];
+            for (int y = 0; y < newH; y++)
+            {
+                int srcRow = (minY + y) * width + minX;
+                int dstRow = y * newW;
+                for (int x = 0; x < newW; x++)
+                    cropped[dstRow + x] = src[srcRow + x];
+            }
+            return true;
+        }
+
+        /// <summary>Axis-aligned world rect of an image, plus whether it looked rotated/skewed.</summary>
+        private static bool TryGetAxisAlignedRect(Image img, out Vector2 min, out Vector2 max, out bool rotated)
+        {
+            var corners = new Vector3[4]; // 0=BL 1=TL 2=TR 3=BR
+            ((RectTransform)img.transform).GetWorldCorners(corners);
+            min = new Vector2(
+                Mathf.Min(Mathf.Min(corners[0].x, corners[1].x), Mathf.Min(corners[2].x, corners[3].x)),
+                Mathf.Min(Mathf.Min(corners[0].y, corners[1].y), Mathf.Min(corners[2].y, corners[3].y)));
+            max = new Vector2(
+                Mathf.Max(Mathf.Max(corners[0].x, corners[1].x), Mathf.Max(corners[2].x, corners[3].x)),
+                Mathf.Max(Mathf.Max(corners[0].y, corners[1].y), Mathf.Max(corners[2].y, corners[3].y)));
+
+            // Rotated if bottom edge is not horizontal or left edge is not vertical.
+            const float eps = 1e-3f;
+            rotated = Mathf.Abs(corners[0].y - corners[3].y) > eps ||
+                      Mathf.Abs(corners[0].x - corners[1].x) > eps;
+            return (max.x - min.x) > 0f && (max.y - min.y) > 0f;
+        }
+
+        /// <summary>
+        /// Shrinks a draw rect from the sprite's full frame (<see cref="Sprite.rect"/>) to the tight
+        /// sub-rect its opaque texels actually occupy. Trimmed / tight-mesh sprites report the full
+        /// frame as their rect but only render the region returned by GetOuterUV; a UI Image maps that
+        /// region onto the padding-inset part of the RectTransform and leaves the border transparent.
+        /// Applying the same inset here keeps the artwork at its true size/position (no stretching) and
+        /// means only the visible pixels — not the transparent background — get composited.
+        /// </summary>
+        private static void InsetBySpritePadding(Sprite sprite, ref Vector2 min, ref Vector2 size)
+        {
+            float rw = sprite.rect.width, rh = sprite.rect.height;
+            if (rw <= 0f || rh <= 0f) return;
+            // GetPadding returns the empty border (left, bottom, right, top) in pixels of sprite.rect.
+            Vector4 pad = UnityEngine.Sprites.DataUtility.GetPadding(sprite);
+            if (pad == Vector4.zero) return;
+            min = new Vector2(min.x + (pad.x / rw) * size.x, min.y + (pad.y / rh) * size.y);
+            size = new Vector2(size.x * (1f - (pad.x + pad.z) / rw),
+                               size.y * (1f - (pad.y + pad.w) / rh));
+        }
+
+        private static void FitPreserveAspect(Sprite sprite, ref Vector2 min, ref Vector2 size)
+        {
+            float spriteAspect = sprite.rect.width / sprite.rect.height;
+            float rectAspect = size.x / size.y;
+            Vector2 drawn;
+            if (rectAspect > spriteAspect) // rect wider than sprite -> fit height
+                drawn = new Vector2(size.y * spriteAspect, size.y);
+            else
+                drawn = new Vector2(size.x, size.x / spriteAspect);
+            min += (size - drawn) * 0.5f;
+            size = drawn;
+        }
+
+        private static float AutoPixelsPerUnit(List<Image> images)
+        {
+            float ppu = 0f;
+            var corners = new Vector3[4];
+            foreach (var img in images)
+            {
+                if (img.sprite == null) continue;
+                ((RectTransform)img.transform).GetWorldCorners(corners);
+                float worldW = Vector2.Distance(corners[0], corners[3]);
+                float worldH = Vector2.Distance(corners[0], corners[1]);
+                if (worldW > 0f) ppu = Mathf.Max(ppu, img.sprite.rect.width / worldW);
+                if (worldH > 0f) ppu = Mathf.Max(ppu, img.sprite.rect.height / worldH);
+            }
+            return ppu > 0f ? ppu : 100f; // fallback for all-solid-colour cases
+        }
+
+        /// <summary>Reads a texture's pixels via a Blit (works even when the texture is not marked readable).</summary>
+        private static (Color32[] px, int w, int h) GetPixels(
+            Texture tex, Dictionary<Texture, (Color32[], int, int)> cache)
+        {
+            if (tex == null) return (new Color32[] { new Color32(255, 255, 255, 255) }, 1, 1);
+            if (cache.TryGetValue(tex, out var cached)) return cached;
+
+            int w = tex.width, h = tex.height;
+            RenderTexture rt = RenderTexture.GetTemporary(w, h, 0, RenderTextureFormat.ARGB32);
+            RenderTexture prev = RenderTexture.active;
+            Graphics.Blit(tex, rt);
+            RenderTexture.active = rt;
+            var tmp = new Texture2D(w, h, TextureFormat.RGBA32, false);
+            tmp.ReadPixels(new Rect(0, 0, w, h), 0, 0);
+            tmp.Apply();
+            RenderTexture.active = prev;
+            RenderTexture.ReleaseTemporary(rt);
+            Color32[] px = tmp.GetPixels32();
+            Object.DestroyImmediate(tmp);
+
+            var entry = (px, w, h);
+            cache[tex] = entry;
+            return entry;
+        }
+
+        private static Color SampleBilinear(Color32[] px, int w, int h, float x, float y)
+        {
+            x = Mathf.Clamp(x - 0.5f, 0f, w - 1f);
+            y = Mathf.Clamp(y - 0.5f, 0f, h - 1f);
+            int x0 = (int)x, y0 = (int)y;
+            int x1 = Mathf.Min(x0 + 1, w - 1);
+            int y1 = Mathf.Min(y0 + 1, h - 1);
+            float fx = x - x0, fy = y - y0;
+
+            Color c00 = px[y0 * w + x0];
+            Color c10 = px[y0 * w + x1];
+            Color c01 = px[y1 * w + x0];
+            Color c11 = px[y1 * w + x1];
+            return Color.Lerp(Color.Lerp(c00, c10, fx), Color.Lerp(c01, c11, fx), fy);
+        }
+
+        /// <summary>Straight-alpha "source over destination".</summary>
+        private static Color Over(Color src, Color dst)
+        {
+            float outA = src.a + dst.a * (1f - src.a);
+            if (outA <= 0f) return new Color(0f, 0f, 0f, 0f);
+            float inv = 1f / outA;
+            return new Color(
+                (src.r * src.a + dst.r * dst.a * (1f - src.a)) * inv,
+                (src.g * src.a + dst.g * dst.a * (1f - src.a)) * inv,
+                (src.b * src.a + dst.b * dst.a * (1f - src.a)) * inv,
+                outA);
+        }
+
+        private static string SanitizeFileName(string name)
+        {
+            if (string.IsNullOrWhiteSpace(name)) name = "CombinedImage";
+            foreach (char c in Path.GetInvalidFileNameChars())
+                name = name.Replace(c, '_');
+            return name;
+        }
+
+        private static string ToAssetPath(string absFile, string projectRoot)
+        {
+            string full = Path.GetFullPath(absFile).Replace('\\', '/');
+            string root = Path.GetFullPath(projectRoot).Replace('\\', '/');
+            if (!full.StartsWith(root + "/")) return null;
+            string rel = full.Substring(root.Length + 1);
+            return rel.StartsWith("Assets/") || rel == "Assets" ? rel : null;
+        }
+    }
+}

Assets/Darkmatter/Code/Features/ImageCombiner/Editor/UIImageCombinerEditor.cs.meta

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Assets/Darkmatter/Code/Features/ImageCombiner/Features.ImageCombiner.asmdef

@@ -0,0 +1,14 @@
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+    "name": "Features.ImageCombiner",
+    "rootNamespace": "Darkmatter.Features.ImageCombiner",
+    "references": [],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
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Assets/Darkmatter/Code/Features/ImageCombiner/Features.ImageCombiner.asmdef.meta

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Assets/Darkmatter/Code/Features/ImageCombiner/UIImageCombiner.cs

@@ -0,0 +1,85 @@
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Darkmatter.Features.ImageCombiner
+{
+    /// <summary>
+    /// Attach to a parent UI object that holds several child <see cref="Image"/> objects
+    /// (each with a transparent background). The custom inspector's "Combine Images" button
+    /// flattens every child Image into a single PNG that has the exact combined bounds,
+    /// position and aspect ratio of the children, saves it to the folder you specify, and
+    /// assigns it back to this object as one Image.
+    ///
+    /// All of the actual combining/saving lives in the editor-only inspector
+    /// (Editor/UIImageCombinerEditor.cs); this component only stores the configuration so it
+    /// still compiles into player builds.
+    /// </summary>
+    [DisallowMultipleComponent]
+    [RequireComponent(typeof(RectTransform))]
+    [AddComponentMenu("Darkmatter/UI/UI Image Combiner")]
+    public sealed class UIImageCombiner : MonoBehaviour
+    {
+        [Header("Output location")]
+        [Tooltip("Folder the combined PNG is written to. Use a project-relative path that starts " +
+                 "with \"Assets/\" (e.g. Assets/Darkmatter/CombinedImages) so it can be imported as a " +
+                 "Sprite and assigned back automatically. An absolute path outside the project just " +
+                 "writes the file to disk.")]
+        [SerializeField] private string _saveFolder = "Assets/Darkmatter/CombinedImages";
+
+        [Tooltip("File name for the combined PNG (without extension). Leave empty to use this " +
+                 "GameObject's name.")]
+        [SerializeField] private string _fileName = "";
+
+        [Header("After combining")]
+        [Tooltip("Destroy the child GameObjects whose images were combined. Takes priority over " +
+                 "\"Disable Children\" when both are ticked.")]
+        [SerializeField] private bool _destroyChildrenAfterCombine = false;
+
+        [Tooltip("Disable (SetActive false) the child GameObjects whose images were combined.")]
+        [SerializeField] private bool _disableChildrenAfterCombine = false;
+
+        [Header("What to combine")]
+        [Tooltip("Also combine Images found on nested (grand-)children, not just direct children.")]
+        [SerializeField] private bool _recurseIntoChildren = true;
+
+        [Tooltip("Include children that are currently inactive in the hierarchy.")]
+        [SerializeField] private bool _includeInactiveChildren = false;
+
+        [Header("Resolution")]
+        [Tooltip("Pixels per world unit for the output texture. 0 = auto: matched to the highest " +
+                 "resolution source sprite so no detail is lost.")]
+        [SerializeField] private float _pixelsPerUnit = 0f;
+
+        [Tooltip("Hard cap for the longest side of the output texture (keeps huge layouts from " +
+                 "producing enormous PNGs). Aspect ratio is preserved.")]
+        [SerializeField] private int _maxDimension = 4096;
+
+        [Header("Trimming")]
+        [Tooltip("Crop the final combined image to the tight bounding box of non-transparent pixels, " +
+                 "so empty/transparent margins are NOT included. The assigned Image is repositioned " +
+                 "and resized to match the trimmed content, keeping each child at its real size.")]
+        [SerializeField] private bool _trimTransparent = true;
+
+        [Tooltip("Pixels with alpha at or below this value are treated as empty when trimming (0..1). " +
+                 "Leave at 0 to keep soft/anti-aliased edges; raise slightly to also trim faint fringes.")]
+        [Range(0f, 1f)]
+        [SerializeField] private float _alphaThreshold = 0f;
+
+        [Header("Assignment")]
+        [Tooltip("Add/reuse an Image on THIS object, assign the combined sprite to it, and resize " +
+                 "this RectTransform to the combined bounds so it lands at the same place and size.")]
+        [SerializeField] private bool _assignCombinedToSelf = true;
+
+        public string SaveFolder => _saveFolder;
+        public string FileName => string.IsNullOrWhiteSpace(_fileName) ? name : _fileName.Trim();
+        public bool DestroyChildrenAfterCombine => _destroyChildrenAfterCombine;
+        public bool DisableChildrenAfterCombine => _disableChildrenAfterCombine;
+        public bool RecurseIntoChildren => _recurseIntoChildren;
+        public bool IncludeInactiveChildren => _includeInactiveChildren;
+        public float PixelsPerUnit => _pixelsPerUnit;
+        public int MaxDimension => Mathf.Max(1, _maxDimension);
+        public bool TrimTransparent => _trimTransparent;
+        public float AlphaThreshold => _alphaThreshold;
+        public bool AssignCombinedToSelf => _assignCombinedToSelf;
+    }
+}

Assets/Darkmatter/Code/Features/ImageCombiner/UIImageCombiner.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 85c9da43c395b794fb2180a6da9f6511

Assets/Darkmatter/Code/Features/MainMenu/UI/MainMenuPresenter.cs

@@ -13,6 +13,7 @@ namespace Darkmatter.Features.Mainmenu
         private readonly IEventBus _eventBus;
         private readonly MainMenuView _view;
         private readonly ISfxPlayer _sfxPlayer;
+        private IDisposable _introSubscription;
 
 
         public MainMenuPresenter(MainMenuView view, IEventBus eventBus, ISfxPlayer sfxPlayer)
@@ -26,7 +27,7 @@ namespace Darkmatter.Features.Mainmenu
         {
             _view.OnPlayBtnPressedEvent += OnPlayBtnPressed;
             _view.OnPlayBtnClickedEvent += OnPlayBtnClicked;
-            _eventBus.Subscribe<IntroCompletedSignal>(OnIntroComplete);
+            _introSubscription = _eventBus.Subscribe<IntroCompletedSignal>(OnIntroComplete);
         }
 
         private void OnIntroComplete(IntroCompletedSignal signal)
@@ -48,6 +49,7 @@ namespace Darkmatter.Features.Mainmenu
         {
             _view.OnPlayBtnPressedEvent -= OnPlayBtnPressed;
             _view.OnPlayBtnClickedEvent -= OnPlayBtnClicked;
+            _introSubscription?.Dispose();
         }
     }
 }

Assets/Darkmatter/Code/Features/Progression/Systems/ProgressionRepository.cs

@@ -86,16 +86,27 @@ public sealed class ProgressionRepository
     {
         if (string.IsNullOrEmpty(templateId) || png == null || png.Length == 0) return;
 
-        Directory.CreateDirectory(ThumbnailDirectory());
+        // Never let thumbnail IO (disk full, permission churn) throw into the save path:
-        var path = ThumbnailPath(templateId);
+        // saves run before every Back/Next navigation, and an unhandled IOException there
-        var tmp = path + ".tmp";
+        // aborts the scene transition and traps the user in gameplay. Losing a thumbnail
-
+        // is fine — the colors themselves persist via PlayerPrefs.
-        await UniTask.RunOnThreadPool(() =>
+        try
         {
-            File.WriteAllBytes(tmp, png);
+            Directory.CreateDirectory(ThumbnailDirectory());
-            if (File.Exists(path)) File.Delete(path);
+            var path = ThumbnailPath(templateId);
-            File.Move(tmp, path);
+            var tmp = path + ".tmp";
-        });
+
+            await UniTask.RunOnThreadPool(() =>
+            {
+                File.WriteAllBytes(tmp, png);
+                if (File.Exists(path)) File.Delete(path);
+                File.Move(tmp, path);
+            });
+        }
+        catch (Exception e)
+        {
+            Debug.LogWarning($"[Progression] Failed writing thumbnail '{templateId}': {e.Message}");
+        }
     }
 
     public async UniTask<Texture2D> LoadThumbnailAsync(string templateId)

Assets/Darkmatter/Code/Libs/Observer/Systems/EventBus.cs

@@ -15,7 +15,23 @@ namespace Darkmatter.Libs.Observer
             if (_map.TryGetValue(typeof(T), out var handlerObj))
             {
                 var action = (Action<T>)handlerObj;
-                action?.Invoke(evt);
+                if (action == null) return;
+
+                // Invoke handlers one by one: a multicast invoke would let one throwing
+                // subscriber silently starve every later subscriber and rethrow into the
+                // publisher (paint / scene-transition code), turning a local bug into a
+                // stuck flow.
+                foreach (var handler in action.GetInvocationList())
+                {
+                    try
+                    {
+                        ((Action<T>)handler).Invoke(evt);
+                    }
+                    catch (Exception e)
+                    {
+                        UnityEngine.Debug.LogException(e);
+                    }
+                }
             }
         }
 

Assets/Darkmatter/Code/Services/Ads/Systems/AdMobAdService.cs

@@ -39,6 +39,11 @@ namespace Darkmatter.Services.Ads
         [SerializeField, Min(0)]
         private int maxInterstitialsPerSession = 8;
 
+        [Tooltip(
+            "Enable only after verifying Firebase/AdMob is not already auto-logging ad_impression for the same ads. Leaving this off avoids duplicate ad_impression counts in GA4/Firebase.")]
+        [SerializeField]
+        private bool logManualAdImpressionEvents;
+
         public bool IsInitialized => _initialized;
         public event Action<AdFormat, AdLoadState> LoadStateChanged;
 
@@ -653,11 +658,12 @@ namespace Darkmatter.Services.Ads
             ad.OnAdClicked += () => LogAdClicked(format);
         }
 
-        // Ad revenue: GA4-recommended ad_impression carries value+currency from AdMob's paid callback —
+        // AdMob/Firebase can auto-log ad_impression for linked apps. Manual logging is opt-in so one
-        // this is what surfaces ad revenue in Firebase/GA4. Ad callbacks fire on the Unity main thread
+        // shown ad does not become two GA4 ad_impression events.
-        // (RaiseAdEventsOnUnityMainThread = true), so logging straight to analytics is safe.
         private void LogAdImpression(AdFormat format, AdValue value)
         {
+            if (!logManualAdImpressionEvents) return;
+
             _analytics?.LogEvent(AnalyticsEvents.AdImpression, new Dictionary<string, object>
             {
                 [AnalyticsParams.AdPlatform] = "AdMob",
@@ -736,4 +742,4 @@ namespace Darkmatter.Services.Ads
             LoadStateChanged?.Invoke(format, state);
         }
     }
-}
+}

Assets/Darkmatter/Code/Services/Analytics/Systems/AnalyticsTracker.cs

@@ -56,8 +56,9 @@ namespace Darkmatter.Services.Analytics
             _subs.Add(_bus.Subscribe<IntroCompletedSignal>(_ => _analytics.LogEvent(AnalyticsEvents.IntroCompleted)));
             _subs.Add(_bus.Subscribe<PlayBtnClickedSignal>(_ => _analytics.LogEvent(AnalyticsEvents.PlayClicked)));
 
-            // Navigation
+            // Navigation. ColorbookShownSignal (not OpenColorBookSignal, which is the show-view command
-            _subs.Add(_bus.Subscribe<OpenColorBookSignal>(_ => _analytics.LogEvent(AnalyticsEvents.ColorbookOpened)));
+            // and misses scene-entry paths) fires on every way the catalog becomes visible.
+            _subs.Add(_bus.Subscribe<ColorbookShownSignal>(_ => OnColorbookShown()));
             _subs.Add(_bus.Subscribe<OpenArtBookSignal>(_ => _analytics.LogEvent(AnalyticsEvents.ArtbookOpened)));
             _subs.Add(_bus.Subscribe<ReturnToMainMenuSignal>(_ => OnReturnToMainMenu()));
 
@@ -90,6 +91,10 @@ namespace Darkmatter.Services.Analytics
 
         private void OnDrawingSelected(string drawingId)
         {
+            // GameplayFlowController relays the selection a second time after the scene swap
+            // (artbook edit path) — same id while already active is that relay, not a new selection.
+            if (drawingId == _activeDrawingId) return;
+
             // A new selection while a drawing is still open (uncompleted) = the previous one was abandoned.
             EndActiveDrawingIfAbandoned();
 
@@ -156,7 +161,7 @@ namespace Darkmatter.Services.Analytics
             if (dur >= 0f) p[AnalyticsParams.DurationSeconds] = dur;
             _analytics.LogEvent(AnalyticsEvents.DrawingCompleted, p);
 
-            // GA4 recommended games event (lights up built-in level funnels).
+            // Companion to GA4's level_start.
             _analytics.LogEvent(AnalyticsEvents.LevelComplete, new Dictionary<string, object>
             {
                 [AnalyticsParams.LevelName] = s.TemplateId,
@@ -171,16 +176,24 @@ namespace Darkmatter.Services.Analytics
             if (PlayerPrefs.GetInt(AllContentKey, 0) == 1) return; // once ever
             PlayerPrefs.SetInt(AllContentKey, 1);
             PlayerPrefs.Save();
-            _analytics.LogEvent(AnalyticsEvents.AllContentCompleted,
+            _analytics.LogEvent(AnalyticsEvents.AllContentCompleted, new Dictionary<string, object>
-                AnalyticsParams.CompletionCount, s.CompletedCount.ToString());
+            {
+                [AnalyticsParams.CompletionCount] = s.CompletedCount,
+            });
         }
 
         private void OnGallerySaveCompleted(GallerySaveCompletedSignal s)
         {
-            _analytics.LogEvent(AnalyticsEvents.GallerySaveCompleted, AnalyticsParams.Success, s.Success ? "true" : "false");
+            // Prefer the id carried by the signal: art-book saves happen with no active drawing.
+            string drawingId = string.IsNullOrEmpty(s.TemplateId) ? _activeDrawingId ?? string.Empty : s.TemplateId;
+            _analytics.LogEvent(AnalyticsEvents.GallerySaveCompleted, new Dictionary<string, object>
+            {
+                [AnalyticsParams.DrawingId] = drawingId,
+                [AnalyticsParams.Success] = s.Success ? 1 : 0,
+            });
             _analytics.LogEvent(AnalyticsEvents.DrawingSaved, new Dictionary<string, object>
             {
-                [AnalyticsParams.DrawingId] = _activeDrawingId ?? string.Empty,
+                [AnalyticsParams.DrawingId] = drawingId,
                 [AnalyticsParams.Success] = s.Success ? 1 : 0,
             });
         }
@@ -191,6 +204,15 @@ namespace Darkmatter.Services.Analytics
             _analytics.LogEvent(AnalyticsEvents.MainMenuReturned);
         }
 
+        private void OnColorbookShown()
+        {
+            // Reaching the catalog with a drawing still open means the player backed out of gameplay
+            // mid-drawing — the abandon moment. (Completion clears the active drawing before the
+            // catalog reloads, so the finish path never lands here with one open.)
+            EndActiveDrawingIfAbandoned();
+            _analytics.LogEvent(AnalyticsEvents.ColorbookOpened);
+        }
+
         // Emits drawing_abandoned for an open, uncompleted drawing. Completion clears _activeDrawingId, so
         // reaching here with a non-null id means the drawing was left without finishing — the leak signal.
         private void EndActiveDrawingIfAbandoned()

Assets/Darkmatter/Code/Services/Audio/Systems/AudioService.cs

@@ -350,7 +350,9 @@ namespace Darkmatter.Services.Audio
             if (!source.gameObject.activeInHierarchy) source.gameObject.SetActive(true);
 
             source.Play();
+#if UNITY_EDITOR || DEVELOPMENT_BUILD
             Debug.Log($"[AudioService] Play clip='{(request.Clip != null ? request.Clip.name : "null")}' ch={request.Channel} vol={source.volume:F2} mixer={(source.outputAudioMixerGroup != null ? source.outputAudioMixerGroup.name : "none")} listener={(AudioListener.volume)} muted={AudioListener.pause} isPlaying={source.isPlaying}");
+#endif
             if (IsChannelPaused(request.Channel))
             {
                 source.Pause();

Assets/Darkmatter/Code/Services/Capture/Systems/CaptureService.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Threading;
 using Cysharp.Threading.Tasks;
@@ -5,6 +6,7 @@ using Darkmatter.Core.Contracts.Services.Camera;
 using Darkmatter.Core.Contracts.Services.Capture;
 using UnityEngine;
 using CameraType = Darkmatter.Core.Enums.Services.Camera.CameraType;
+using Object = UnityEngine.Object;
 
 namespace Darkmatter.Services.Capture
 {
@@ -15,7 +17,7 @@ namespace Darkmatter.Services.Capture
         public CaptureService(ICameraService cameraService) => _cameraService = cameraService;
 
         public async UniTask<byte[]> CapturePngAsync(GameObject captureObject, float scale,
-            CancellationToken cancellationToken = default)
+            Func<IDisposable> captureViewScopeFactory = null, CancellationToken cancellationToken = default)
         {
             if (captureObject == null) return null;
             var paperRT = captureObject.transform as RectTransform;
@@ -26,10 +28,6 @@ namespace Darkmatter.Services.Capture
             int sw = Screen.width;
             int sh = Screen.height;
 
-            Rect crop = ComputeCropRect(captureObject, sw, sh);
-            int cropW = Mathf.Max(1, (int)crop.width);
-            int cropH = Mathf.Max(1, (int)crop.height);
-
             var prevFlags = cam.clearFlags;
             var prevBg = cam.backgroundColor;
             var prevTarget = cam.targetTexture;
@@ -41,15 +39,22 @@ namespace Darkmatter.Services.Capture
 
             List<Canvas> disabledCanvases = null;
             List<UnityEngine.UI.Graphic> disabledGraphics = null;
+            IDisposable captureViewScope = null;
 
             try
             {
                 await UniTask.WaitForEndOfFrame(cancellationToken);
 
+                captureViewScope = captureViewScopeFactory?.Invoke();
+
                 disabledCanvases = DisableOtherRootCanvases(paperCanvas);
                 disabledGraphics = HideNonPaperGraphics(paperRT);
                 HideBackdropGraphics(paperRT, disabledGraphics);
 
+                Rect crop = ComputeCropRect(captureObject, sw, sh);
+                int cropW = Mathf.Max(1, (int)crop.width);
+                int cropH = Mathf.Max(1, (int)crop.height);
+
                 cam.clearFlags = CameraClearFlags.SolidColor;
                 cam.backgroundColor = new Color(0f, 0f, 0f, 0f);
                 cam.targetTexture = rt;
@@ -63,52 +68,58 @@ namespace Darkmatter.Services.Capture
 
                 var prevActive = RenderTexture.active;
                 RenderTexture.active = rt;
-                var fullScreen = new Texture2D(sw, sh, TextureFormat.RGBA32, mipChain: false);
+                // Read only the crop region straight off the RT. A full-screen ReadPixels followed by
-                fullScreen.ReadPixels(new Rect(0, 0, sw, sh), 0, 0);
+                // GetPixels/SetPixels cropping allocated a managed Color[] at 16 bytes/pixel (tens of MB)
-                fullScreen.Apply();
+                // on every capture — autosave runs this after each paint, OOM-killing low-RAM devices.
-                RenderTexture.active = prevActive;
+                var cropped = new Texture2D(cropW, cropH, TextureFormat.RGBA32, mipChain: false);
-
                 try
                 {
-                    var cropped = new Texture2D(cropW, cropH, TextureFormat.RGBA32, mipChain: false);
+                    cropped.ReadPixels(new Rect(crop.x, crop.y, cropW, cropH), 0, 0);
+                    cropped.Apply();
+                    RenderTexture.active = prevActive;
+                    captureViewScope?.Dispose();
+                    captureViewScope = null;
+
+                    int targetW = Mathf.Max(1, Mathf.RoundToInt(cropW * scale));
+                    int targetH = Mathf.Max(1, Mathf.RoundToInt(cropH * scale));
+                    Texture2D output = cropped;
+                    if (output.width != targetW || output.height != targetH)
+                        output = Resize(cropped, targetW, targetH);
+
                     try
                     {
-                        cropped.SetPixels(fullScreen.GetPixels((int)crop.x, (int)crop.y, cropW, cropH));
+                        return output.EncodeToPNG();
-                        cropped.Apply();
-
-                        int targetW = Mathf.Max(1, Mathf.RoundToInt(cropW * scale));
-                        int targetH = Mathf.Max(1, Mathf.RoundToInt(cropH * scale));
-                        Texture2D output = cropped;
-                        if (output.width != targetW || output.height != targetH)
-                            output = Resize(cropped, targetW, targetH);
-
-                        try
-                        {
-                            return output.EncodeToPNG();
-                        }
-                        finally
-                        {
-                            if (output != cropped) Object.Destroy(output);
-                        }
                     }
                     finally
                     {
-                        Object.Destroy(cropped);
+                        if (output != cropped) Object.Destroy(output);
                     }
                 }
                 finally
                 {
-                    Object.Destroy(fullScreen);
+                    RenderTexture.active = prevActive;
+                    Object.Destroy(cropped);
                 }
             }
             finally
             {
-                paperCanvas.renderMode = prevMode;
+                // The awaits above give scene teardown (autosave racing an unload) a chance to
-                paperCanvas.worldCamera = prevWorldCam;
+                // destroy the canvas or camera; touching them then would throw from finally and
-                paperCanvas.planeDistance = prevPlaneDist;
+                // skip the rest of the restore.
-                cam.targetTexture = prevTarget;
+                if (paperCanvas != null)
-                cam.clearFlags = prevFlags;
+                {
-                cam.backgroundColor = prevBg;
+                    paperCanvas.renderMode = prevMode;
+                    paperCanvas.worldCamera = prevWorldCam;
+                    paperCanvas.planeDistance = prevPlaneDist;
+                }
+
+                if (cam != null)
+                {
+                    cam.targetTexture = prevTarget;
+                    cam.clearFlags = prevFlags;
+                    cam.backgroundColor = prevBg;
+                }
+
                 RenderTexture.ReleaseTemporary(rt);
                 if (disabledGraphics != null)
                     foreach (var g in disabledGraphics)
@@ -118,6 +129,7 @@ namespace Darkmatter.Services.Capture
                     foreach (var c in disabledCanvases)
                         if (c != null)
                             c.enabled = true;
+                captureViewScope?.Dispose();
             }
         }
 
@@ -217,4 +229,4 @@ namespace Darkmatter.Services.Capture
             }
         }
     }
-}
+}

Assets/Darkmatter/Code/Services/Gallery/Core/GalleryService.cs

@@ -118,8 +118,17 @@ namespace Darkmatter.Services.Gallery
                 GL.PopMatrix();
 
                 var output = new Texture2D(bgW, bgH, TextureFormat.RGBA32, mipChain: false);
-                output.ReadPixels(new Rect(0, 0, bgW, bgH), 0, 0);
+                try
-                output.Apply();
+                {
+                    output.ReadPixels(new Rect(0, 0, bgW, bgH), 0, 0);
+                    output.Apply();
+                }
+                catch
+                {
+                    UnityEngine.Object.Destroy(output);
+                    throw;
+                }
+
                 return output;
             }
             finally

Assets/Darkmatter/CombinedImages.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: f1145a5667c602e4d9754ffb14ba9f58
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Darkmatter/CombinedImages/BottomWingsCircle.png.meta

@@ -0,0 +1,234 @@
+fileFormatVersion: 2
+guid: 1951198dacf07e54dbed73ea007ea12e
+TextureImporter:
+  internalIDToNameTable:
+  - first:
+      213: -8051739824182752894
+    second: BottomWingsCircle_0
+  - first:
+      213: -2728466869657715014
+    second: BottomWingsCircle_1
+  - first:
+      213: 8546343078113801825
+    second: BottomWingsCircle_2
+  - first:
+      213: -4528582518283939828
+    second: BottomWingsCircle_3
+  externalObjects: {}
+  serializedVersion: 13
+  mipmaps:
+    mipMapMode: 0
+    enableMipMap: 0
+    sRGBTexture: 1
+    linearTexture: 0
+    fadeOut: 0
+    borderMipMap: 0
+    mipMapsPreserveCoverage: 0
+    alphaTestReferenceValue: 0.5
+    mipMapFadeDistanceStart: 1
+    mipMapFadeDistanceEnd: 3
+  bumpmap:
+    convertToNormalMap: 0
+    externalNormalMap: 0
+    heightScale: 0.25
+    normalMapFilter: 0
+    flipGreenChannel: 0
+  isReadable: 1
+  streamingMipmaps: 0
+  streamingMipmapsPriority: 0
+  vTOnly: 0
+  ignoreMipmapLimit: 0
+  grayScaleToAlpha: 0
+  generateCubemap: 6
+  cubemapConvolution: 0
+  seamlessCubemap: 0
+  textureFormat: 1
+  maxTextureSize: 2048
+  textureSettings:
+    serializedVersion: 2
+    filterMode: 1
+    aniso: 1
+    mipBias: 0
+    wrapU: 1
+    wrapV: 1
+    wrapW: 1
+  nPOTScale: 0
+  lightmap: 0
+  compressionQuality: 50
+  spriteMode: 1
+  spriteExtrude: 1
+  spriteMeshType: 1
+  alignment: 0
+  spritePivot: {x: 0.5, y: 0.5}
+  spritePixelsToUnits: 100
+  spriteBorder: {x: 0, y: 0, z: 0, w: 0}
+  spriteGenerateFallbackPhysicsShape: 1
+  alphaUsage: 1
+  alphaIsTransparency: 1
+  spriteTessellationDetail: -1
+  textureType: 8
+  textureShape: 1
+  singleChannelComponent: 0
+  flipbookRows: 1
+  flipbookColumns: 1
+  maxTextureSizeSet: 0
+  compressionQualitySet: 0
+  textureFormatSet: 0
+  ignorePngGamma: 0
+  applyGammaDecoding: 0
+  swizzle: 50462976
+  cookieLightType: 0
+  platformSettings:
+  - serializedVersion: 4
+    buildTarget: DefaultTexturePlatform
+    maxTextureSize: 2048
+    resizeAlgorithm: 0
+    textureFormat: -1
+    textureCompression: 1
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
+    ignorePlatformSupport: 0
+    androidETC2FallbackOverride: 0
+    forceMaximumCompressionQuality_BC6H_BC7: 0
+  - serializedVersion: 4
+    buildTarget: Standalone
+    maxTextureSize: 2048
+    resizeAlgorithm: 0
+    textureFormat: -1
+    textureCompression: 1
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
+    ignorePlatformSupport: 0
+    androidETC2FallbackOverride: 0
+    forceMaximumCompressionQuality_BC6H_BC7: 0
+  - serializedVersion: 4
+    buildTarget: Android
+    maxTextureSize: 2048
+    resizeAlgorithm: 0
+    textureFormat: -1
+    textureCompression: 1
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
+    ignorePlatformSupport: 0
+    androidETC2FallbackOverride: 0
+    forceMaximumCompressionQuality_BC6H_BC7: 0
+  spriteSheet:
+    serializedVersion: 2
+    sprites:
+    - serializedVersion: 2
+      name: BottomWingsCircle_0
+      rect:
+        serializedVersion: 2
+        x: 0
+        y: 0
+        width: 66
+        height: 65
+      alignment: 0
+      pivot: {x: 0, y: 0}
+      border: {x: 0, y: 0, z: 0, w: 0}
+      customData: 
+      outline: []
+      physicsShape: []
+      tessellationDetail: -1
+      bones: []
+      spriteID: 28988b33a49724090800000000000000
+      internalID: -8051739824182752894
+      vertices: []
+      indices: 
+      edges: []
+      weights: []
+    - serializedVersion: 2
+      name: BottomWingsCircle_1
+      rect:
+        serializedVersion: 2
+        x: 108
+        y: 13
+        width: 65
+        height: 66
+      alignment: 0
+      pivot: {x: 0, y: 0}
+      border: {x: 0, y: 0, z: 0, w: 0}
+      customData: 
+      outline: []
+      physicsShape: []
+      tessellationDetail: -1
+      bones: []
+      spriteID: abe31ac86d9822ad0800000000000000
+      internalID: -2728466869657715014
+      vertices: []
+      indices: 
+      edges: []
+      weights: []
+    - serializedVersion: 2
+      name: BottomWingsCircle_2
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