diff --git a/Assets/Scripts/Mechanics/GameOptimizer.cs b/Assets/Scripts/Mechanics/GameOptimizer.cs
index 6a7ae66..ecccdf4 100644
--- a/Assets/Scripts/Mechanics/GameOptimizer.cs
+++ b/Assets/Scripts/Mechanics/GameOptimizer.cs
@@ -30,8 +30,8 @@ namespace Platformer.Mechanics
         [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
         static void SetupJumpThroughPlatforms()
         {
-            // BT5-Dev #45 — Level Tilemap 영역 Layer 16 복원 (PD 의도: 점프 영역 통과·footHit 영역 영역 영역). Tilemap 단일 GameObject = 모든 Tile 동일 동작.
-            int applied = 0, excluded = 0;
+            // BT5-Dev #46 — PD 제안 채택: Level Tilemap = Layer 0 (일반 지면·벽 영구 충돌) / Foreground Tilemap = Layer 16 (공중 발판 Drop-Through·Tile m_ColliderType=Sprite 런타임 강제)
+            int applied = 0, excluded = 0, levelKept = 0;
             var allColliders = Object.FindObjectsByType<Collider2D>(FindObjectsSortMode.None);
             var appliedNames = new System.Collections.Generic.List<string>();
             foreach (var c in allColliders)
@@ -49,28 +49,57 @@ namespace Platformer.Mechanics
                     continue;
                 }
 
+                // BT46 — Level Tilemap (TilemapCollider2D + name='Level') = Layer 0 (일반 지면·벽 영구 충돌)
+                if (c.GetComponent<UnityEngine.Tilemaps.TilemapCollider2D>() != null && c.gameObject.name == "Level")
+                {
+                    if (c.gameObject.layer == 16) c.gameObject.layer = 0;  // 잔존 복원
+                    var lvlEffector = c.GetComponent<PlatformEffector2D>();
+                    if (lvlEffector != null) Object.Destroy(lvlEffector);
+                    c.usedByEffector = false;
+                    levelKept++;
+                    continue;
+                }
+
                 var effector = c.GetComponent<PlatformEffector2D>();
                 if (effector != null) Object.Destroy(effector);
                 c.usedByEffector = false;
-
-                // BT5-Dev #45 — 모든 일반 Collider(Level Tilemap 포함) Layer 16 (PD 의도: 점프 영역 통과·footHit 영역 영역)
                 c.gameObject.layer = 16;
                 applied++;
                 if (appliedNames.Count < 8) appliedNames.Add($"{c.gameObject.name}({c.GetType().Name})");
             }
 
-            // BT45 — Foreground 영역 미부착 시 TilemapCollider2D 동적 추가 + Layer 16
+            // BT46 — Foreground GameObject TilemapCollider2D + Layer 16 + 모든 Tile m_ColliderType=Sprite 런타임 강제
             var foreground = GameObject.Find("Foreground");
             if (foreground != null)
             {
                 var fgTc = foreground.GetComponent<UnityEngine.Tilemaps.TilemapCollider2D>();
                 if (fgTc == null) fgTc = foreground.AddComponent<UnityEngine.Tilemaps.TilemapCollider2D>();
                 foreground.layer = 16;
-                Debug.Log($"[BT45-Foreground] TilemapCollider2D + Layer 16 applied to 'Foreground'");
+
+                var fgTilemap = foreground.GetComponent<UnityEngine.Tilemaps.Tilemap>();
+                if (fgTilemap != null)
+                {
+                    var bounds = fgTilemap.cellBounds;
+                    int forced = 0;
+                    for (int x = bounds.xMin; x <= bounds.xMax; x++)
+                    {
+                        for (int y = bounds.yMin; y <= bounds.yMax; y++)
+                        {
+                            var pos = new Vector3Int(x, y, 0);
+                            if (fgTilemap.HasTile(pos))
+                            {
+                                fgTilemap.SetColliderType(pos, UnityEngine.Tilemaps.Tile.ColliderType.Sprite);
+                                forced++;
+                            }
+                        }
+                    }
+                    fgTc.ProcessTilemapChanges();
+                    Debug.Log($"[BT46-Foreground] TilemapCollider2D + Layer 16 + ColliderType=Sprite forced on {forced} tiles");
+                }
             }
 
-            Debug.Log($"[BT45-DropThrough] Layer16 applied={applied} excluded={excluded} total={allColliders.Length}");
-            Debug.Log($"[BT45-DropThrough] appliedSamples=[{string.Join(", ", appliedNames)}]");
+            Debug.Log($"[BT46-DropThrough] Layer16 applied={applied} levelKeptLayer0={levelKept} excluded={excluded} total={allColliders.Length}");
+            Debug.Log($"[BT46-DropThrough] appliedSamples=[{string.Join(", ", appliedNames)}]");
         }
     }
 }