built

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

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

@@ -14,6 +14,7 @@ namespace Darkmatter.Core.Contracts.Features.DrawingCatalog
         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

@@ -8,7 +8,10 @@ namespace Darkmatter.Core.Contracts.Features.DrawingCatalog
     {
         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/Data/Static/Features/DrawingTemplate/DrawingTemplateSO.cs

@@ -18,6 +18,7 @@ namespace Darkmatter.Core.Data.Static.Features.DrawingTemplate
         [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";
@@ -33,6 +34,7 @@ namespace Darkmatter.Core.Data.Static.Features.DrawingTemplate
         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;
@@ -41,7 +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)
         {
@@ -51,6 +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/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/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/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 +31,14 @@ 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();
@@ -47,7 +53,8 @@ public class ColoringController : IColoringController, IDisposable
         IAssetProviderService assetProviderService,
         IUndoStack history,
         IGameplaySceneRefs refs,
-        ColorPaletteHolderView paletteHolder)
+        ColorPaletteHolderView paletteHolder,
+        IAudioService audioService)
     {
         _repository = repository;
         _buttonFactory = buttonFactory;
@@ -57,6 +64,7 @@ public class ColoringController : IColoringController, IDisposable
         _pinchZoom = pinchZoom;
         _refs = refs;
         _paletteHolder = paletteHolder;
+        _audioService = audioService;
     }
 
     public async UniTask InitializeRegionsAsync(IDrawingTemplate template,
@@ -117,6 +125,7 @@ public class ColoringController : IColoringController, IDisposable
             _pinchZoom.ResetZoom();
         _completionAnimationInstance.SetActive(true);
         _isPlayingCompletionAnimation = true;
+        PlayCompletionSound();
         try
         {
             await _completionAnimationView.PlayAsync(ct);
@@ -129,6 +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
@@ -167,6 +193,7 @@ public class ColoringController : IColoringController, IDisposable
     {
         _history.Drop();
         _isPlayingCompletionAnimation = false;
+        StopCompletionSound();
 
         foreach (var button in _buttons)
             if (button != null)
@@ -182,6 +209,7 @@ public class ColoringController : IColoringController, IDisposable
             _completionAnimationInstance = null;
             _completionAnimationView = null;
         }
+        _completionSound = null;
 
         if (_colorInstance != null)
         {
@@ -205,6 +233,7 @@ public class ColoringController : IColoringController, IDisposable
             _completionAnimationView = _completionAnimationInstance.GetComponentInChildren<CompletionAnimationView>(includeInactive: true);
             _completionAnimationInstance.SetActive(false);
         }
+        _completionSound = template.CompletionSound;
         var views = _colorInstance.GetComponentsInChildren<ColorRegionView>(includeInactive: true);
 
         foreach (var region in views)

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

@@ -1,5 +1,6 @@
 using System;
 using UnityEngine;
+using UnityEngine.EventSystems;
 using UnityEngine.InputSystem;
 
 namespace Darkmatter.Features.Coloring.Systems
@@ -8,6 +9,7 @@ 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;
@@ -22,6 +24,7 @@ namespace Darkmatter.Features.Coloring.Systems
         private float _currentZoom = 1f;
         private Vector3 _baseScale = Vector3.one;
         private Vector2 _baseAnchoredPosition;
+        private PanDragRelay _panRelay;
 
         public void SetTarget(RectTransform target)
         {
@@ -34,6 +37,26 @@ namespace Darkmatter.Features.Coloring.Systems
             _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()
@@ -46,6 +69,7 @@ namespace Darkmatter.Features.Coloring.Systems
 
             _currentZoom = 1f;
             _isPinching = false;
+            UpdatePanRelayState();
         }
 
         public IDisposable UseNonZoomedView()
@@ -78,6 +102,7 @@ namespace Darkmatter.Features.Coloring.Systems
 
             _isPinching = false;
             TryApplyScrollZoom();
+            TryApplyMousePan();
         }
 
         private bool TryApplyPinchZoom()
@@ -111,8 +136,16 @@ namespace Darkmatter.Features.Coloring.Systems
                 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);
-            ZoomTowards(midpointLocal, targetZoom);
+            ApplyZoomPan(previousMidpointLocal, midpointLocal, targetZoom);
             return true;
         }
 
@@ -152,12 +185,123 @@ namespace Darkmatter.Features.Coloring.Systems
                 return;
             }
 
-            Vector2 contentPoint = (parentLocalPoint - _target.anchoredPosition) / _currentZoom;
+            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 = Mathf.Approximately(_currentZoom, minZoom)
+            _target.anchoredPosition = ClampPan(currentLocalPoint - contentPoint * _currentZoom);
-                ? _baseAnchoredPosition
+            UpdatePanRelayState();
-                : parentLocalPoint - contentPoint * _currentZoom;
+        }
+
+        // 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)
@@ -233,6 +377,7 @@ namespace Darkmatter.Features.Coloring.Systems
             _target.anchoredPosition = state.AnchoredPosition;
             _currentZoom = state.CurrentZoom;
             _isPinching = false;
+            UpdatePanRelayState();
         }
 
         private readonly struct ViewState
@@ -285,5 +430,25 @@ namespace Darkmatter.Features.Coloring.Systems
                 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/DrawingCatalog/UI/DrawingCatalogPresenter.cs

@@ -25,6 +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)
         {
@@ -108,6 +114,12 @@ namespace Darkmatter.Features.DrawingCatalog
             RefreshAsync(_cts.Token).Forget();
 
         private async UniTask RefreshAsync(CancellationToken ct)
+        {
+            var newSprites = new List<Sprite>();
+            var newTextures = new List<Texture2D>();
+            var applied = false;
+
+            try
             {
                 var ids = ToFixedRowGridOrder(_controller.VisibleIds);
                 var vms = new List<CatalogItemVM>(ids.Count);
@@ -118,7 +130,13 @@ namespace Darkmatter.Features.DrawingCatalog
                 foreach (var id in ids)
                 {
                     if (ct.IsCancellationRequested) return;
-                var thumb = await _catalog.GetThumbnailAsync(id);
+                    var (thumb, owned) = await _catalog.GetThumbnailAsync(id);
+                    if (owned)
+                    {
+                        newSprites.Add(thumb);
+                        newTextures.Add(thumb.texture);
+                    }
+
                     vms.Add(new CatalogItemVM(id, thumb));
                 }
 
@@ -127,12 +145,44 @@ namespace Darkmatter.Features.DrawingCatalog
                 _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)
         {
@@ -160,6 +210,7 @@ namespace Darkmatter.Features.DrawingCatalog
             _openSubscription?.Dispose();
             _cts.Cancel();
             _cts.Dispose();
+            DestroyOwnedThumbnails();
         }
     }
 }

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

@@ -217,6 +217,11 @@ namespace Darkmatter.Features.DrawingTemplates.Editor
                         : $"{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)"));
@@ -241,7 +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();
                     }
@@ -273,7 +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();
                     }
@@ -341,7 +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();
@@ -421,7 +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();
@@ -621,7 +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

@@ -53,7 +53,7 @@ namespace Darkmatter.Features.DrawingTemplates.Systems
             _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?");
@@ -62,9 +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)

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

@@ -46,6 +46,7 @@ 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;
@@ -80,6 +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;
@@ -127,7 +149,30 @@ 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)
+        {
+            // A second navigation while one runs (e.g. Back pressed during the completion
+            // animation inside NextAsync) would interleave two saves and two Colorbook loads,
+            // and Clear() would rip the celebration apart mid-flight. First navigation wins.
+            if (_navigating) return;
+            _navigating = true;
+            try
             {
                 await SaveCurrentAsync(CancellationToken.None);
                 _loadingScreen.Show();
@@ -136,6 +181,11 @@ namespace Darkmatter.Features.GameplayFlow.Systems
                 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)
         {
@@ -146,6 +196,10 @@ namespace Darkmatter.Features.GameplayFlow.Systems
         }
 
         public async UniTask NextAsync(CancellationToken ct)
+        {
+            if (_navigating) return;
+            _navigating = true;
+            try
             {
                 // Drop any debounced autosave so it can't fire during/after the completion
                 // animation and capture the animation (or an empty paper) into the thumbnail.
@@ -173,23 +227,19 @@ namespace Darkmatter.Features.GameplayFlow.Systems
                 }
 
                 var nextId = _catalog.GetNextTemplate(_templateId);
-            if (string.IsNullOrEmpty(nextId))
-            {
-                _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;
-            }
-
                 _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);
+                if (!string.IsNullOrEmpty(nextId))
                     _bus.Publish(new DrawingSelectedSignal(nextId));
             }
+            finally
+            {
+                _navigating = false;
+            }
+        }
         
         
         private void OnShapeAssembled(ShapeAssembledSignal signal)
@@ -232,6 +282,10 @@ namespace Darkmatter.Features.GameplayFlow.Systems
         }
 
         private async UniTaskVoid EditAsync(string newTemplateId)
+        {
+            if (_navigating) return;
+            _navigating = true;
+            try
             {
                 await SaveCurrentAsync(CancellationToken.None);
                 _loadingScreen.Show();
@@ -241,6 +295,11 @@ namespace Darkmatter.Features.GameplayFlow.Systems
                 await _scenes.UnloadSceneAsync(nameof(GameScene.Gameplay), progress: null, cancellationToken: default);
                 _bus.Publish(new DrawingSelectedSignal(newTemplateId));
             }
+            finally
+            {
+                _navigating = false;
+            }
+        }
 
         private async UniTaskVoid DebouncedAutosaveAsync(CancellationToken ct)
         {

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

@@ -86,6 +86,12 @@ public sealed class ProgressionRepository
     {
         if (string.IsNullOrEmpty(templateId) || png == null || png.Length == 0) return;
 
+        // Never let thumbnail IO (disk full, permission churn) throw into the save path:
+        // saves run before every Back/Next navigation, and an unhandled IOException there
+        // aborts the scene transition and traps the user in gameplay. Losing a thumbnail
+        // is fine — the colors themselves persist via PlayerPrefs.
+        try
+        {
             Directory.CreateDirectory(ThumbnailDirectory());
             var path = ThumbnailPath(templateId);
             var tmp = path + ".tmp";
@@ -97,6 +103,11 @@ public sealed class ProgressionRepository
                 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/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

@@ -72,14 +72,14 @@ namespace Darkmatter.Services.Capture
                 // GetPixels/SetPixels cropping allocated a managed Color[] at 16 bytes/pixel (tens of MB)
                 // on every capture — autosave runs this after each paint, OOM-killing low-RAM devices.
                 var cropped = new Texture2D(cropW, cropH, TextureFormat.RGBA32, mipChain: false);
+                try
+                {
                     cropped.ReadPixels(new Rect(crop.x, crop.y, cropW, cropH), 0, 0);
                     cropped.Apply();
                     RenderTexture.active = prevActive;
                     captureViewScope?.Dispose();
                     captureViewScope = null;
 
-                try
-                {
                     int targetW = Mathf.Max(1, Mathf.RoundToInt(cropW * scale));
                     int targetH = Mathf.Max(1, Mathf.RoundToInt(cropH * scale));
                     Texture2D output = cropped;
@@ -97,17 +97,29 @@ namespace Darkmatter.Services.Capture
                 }
                 finally
                 {
+                    RenderTexture.active = prevActive;
                     Object.Destroy(cropped);
                 }
             }
             finally
+            {
+                // The awaits above give scene teardown (autosave racing an unload) a chance to
+                // destroy the canvas or camera; touching them then would throw from finally and
+                // skip the rest of the restore.
+                if (paperCanvas != null)
                 {
                     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)

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);
+                try
+                {
                     output.ReadPixels(new Rect(0, 0, bgW, bgH), 0, 0);
                     output.Apply();
+                }
+                catch
+                {
+                    UnityEngine.Object.Destroy(output);
+                    throw;
+                }
+
                 return output;
             }
             finally

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+guid: 6eec8891b258c44489104669182fbe6c
+AudioImporter:
+  externalObjects: {}
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Assets/Darkmatter/Content/Audio/pronunciation/Bangles.mp3.meta

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+AudioImporter:
+  externalObjects: {}
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+guid: 36671d416af67c3489ca34f657bc1b8c
+AudioImporter:
+  externalObjects: {}
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+guid: 89ff39f364accd04ab402f2bab9dc1b2
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Assets/Darkmatter/Content/Audio/pronunciation/Cat.mp3.meta

@@ -0,0 +1,23 @@
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+guid: 0a4bf723010b92241ad4291a054d5ca2
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+  externalObjects: {}
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Assets/Darkmatter/Content/Audio/pronunciation/Doll.mp3.meta

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+guid: 3848293c8818eb04c9d965ee879e8d72
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Assets/Darkmatter/Content/Audio/pronunciation/Donut 1.mp3.meta

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Assets/Darkmatter/Content/Audio/pronunciation/Flowers.mp3.meta

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