diff --git a/Assets/_Game/Scripts/World/CheckpointMarker.cs b/Assets/_Game/Scripts/World/CheckpointMarker.cs
index 9259999..7aeb0a1 100644
--- a/Assets/_Game/Scripts/World/CheckpointMarker.cs
+++ b/Assets/_Game/Scripts/World/CheckpointMarker.cs
@@ -9,9 +9,10 @@ namespace BaseGames.World
     /// 玩家经过时自动激活，成为 LethalTrap 回溯的目标位置。
     ///
     /// 设计要点：
-    ///   - 同一房间可放置多个，取最近经过的一个
+    ///   - 同一房间可放置多个，取最近经过的一个（折返重新经过早先的标记同样覆盖注册）
     ///   - 激活状态仅存于运行时，不持久化，换房间后重置
-    ///   - 每个 CheckpointMarker 仅激活一次（重复进入同一触发区无效）
+    ///   - 闩锁按接触周期：进入时注册并广播一次，离开触发区后重置，
+    ///     同一次接触内不重复结算
     /// </summary>
     [RequireComponent(typeof(Collider2D))]
     public class CheckpointMarker : MonoBehaviour
@@ -26,7 +27,7 @@ namespace BaseGames.World
 
         private bool _isActivated;
 
-        /// <summary>当前运行时是否已被激活。</summary>
+        /// <summary>本次接触是否已注册过（玩家离开触发区后重置）。</summary>
         public bool IsActivated => _isActivated;
 
         private void Awake()
@@ -49,6 +50,12 @@ namespace BaseGames.World
             _onCheckpointReached?.Raise();
         }
 
+        private void OnTriggerExit2D(Collider2D other)
+        {
+            if ((_playerLayers.value & (1 << other.gameObject.layer)) == 0) return;
+            _isActivated = false;
+        }
+
         private void OnDrawGizmos()
         {
             Gizmos.color = _isActivated