diff --git a/302/Assets/Scripts/InteractionManager.cs b/302/Assets/Scripts/InteractionManager.cs
index 48ae7fa..3a10bb1 100644
--- a/302/Assets/Scripts/InteractionManager.cs
+++ b/302/Assets/Scripts/InteractionManager.cs
@@ -21,7 +21,7 @@ public class InteractionManager : AbstractStageObserver
     public override string Name { get; } = "InteractionManager";
 
     // 클래스 인스턴스
-    public static PlayerManager Instance { get; private set; }
+    public static InteractionManager Instance { get; private set; }
 
     /************
      * messages *
diff --git a/302/Assets/Scripts/PauseManager.cs b/302/Assets/Scripts/PauseManager.cs
new file mode 100644
index 0000000..f946437
--- /dev/null
+++ b/302/Assets/Scripts/PauseManager.cs
@@ -0,0 +1,152 @@
+using UnityEngine;
+
+public class PauseManager : AbstractStageObserver
+{
+    /**********
+     * fields *
+     **********/
+
+    // 캔버스 이름
+    public string nameCanvas;
+
+    // 종료를 위한 입력 시간
+    public double timeExit;
+
+    // 캔버스
+    private Canvas _canvas;
+
+    // 시간
+    private double _timeKeyDown;
+
+    /**************
+     * properties *
+     **************/
+
+    // 클래스 이름
+    public override string Name { get; } = "PauseManager";
+
+    // 클래스 인스턴스
+    public static PauseManager Instance { get; private set; }
+
+    /************
+     * messages *
+     ************/
+
+    void Update()
+    {
+        double time = Time.unscaledTimeAsDouble;
+
+        if (Input.GetKeyDown(KeyCode.Escape)) {
+            _timeKeyDown = time;
+        } else if (Input.GetKey(KeyCode.Escape) && time - _timeKeyDown >= timeExit) {
+            ExitGame();
+        } else if (Input.GetKeyUp(KeyCode.Escape) && time - _timeKeyDown < timeExit) {
+            if (GameManager.Instance.State == GameManager.GameState.Playing) {
+                PauseGame();
+            } else if (GameManager.Instance.State == GameManager.GameState.Paused) {
+                ResumeGame();
+            }
+        }
+    }
+
+    /*************************************
+     * implementation: AbstractBehaviour *
+     *************************************/
+
+    // `Awake` 메시지 용 메서드
+    protected override bool Awake_()
+    {
+        bool res = false;
+
+        if (Instance == null) {
+            Log($"`Instance` has not been set => set `Instance` as `{Name}`");
+            Instance = this;
+            DontDestroyOnLoad(gameObject);
+            res = base.Awake_();
+        } else {
+            Log($"`Instance` has already been set => destroy `{gameObject.name}`");
+            Destroy(gameObject);
+        }
+
+        return res;
+    }
+
+    // `Start` 메시지 용 메서드
+    protected override bool Start_()
+    {
+        bool res = base.Start_();
+
+        // TODO: `Start` 메시지에서 해야할 것 넣기. 없으면 메서드를 아예 지워도 됨.
+        // 함수가 제대로 작동했으면 `true`를, 아니면 `false`를 반환.
+
+        return res;
+    }
+
+    // 필드를 초기화하는 메서드
+    protected override bool InitFields()
+    {
+        bool res = base.InitFields();
+
+        // TODO: 필드 초기화할 것 넣기. 없으면 메서드를 아예 지워도 됨.
+        // (사실 필드 말고 초기화할 것도 넣어도 됨....)
+        // 함수가 제대로 작동했으면 `true`를, 아니면 `false`를 반환.
+
+        return res;
+    }
+
+    /*****************************************
+     * implementation: AbstractStageObserver *
+     *****************************************/
+
+    // 단계 변경 시 불리는 메서드
+    public override bool UpdateStage()
+    {
+        GameObject obj = GameObject.Find(nameCanvas);
+        bool res = base.UpdateStage();
+
+        if (obj != null) {
+            Log($"Find `{nameCanvas}` success");
+
+            _canvas = obj.GetComponent<Canvas>();
+            if (_canvas != null) {
+                Log("Find `Canvas` success");
+            } else {
+                Log("Find `Canvas` failed", mode: 1);
+                res = false;
+            }
+        } else {
+            Log($"Find `{nameCanvas}` failed", mode: 1);
+            res = false;
+        }
+
+        return res;
+    }
+
+    /***************
+     * new methods *
+     ***************/
+
+    private void PauseGame()
+    {
+        Log("Pause the game");
+        GameManager.Instance.PauseGame();
+        _canvas.gameObject.SetActive(true);
+    }
+
+    private void ResumeGame()
+    {
+        Log("Resume the game");
+        GameManager.Instance.ResumeGame();
+        _canvas.gameObject.SetActive(false);
+    }
+
+    private void ExitGame()
+    {
+        Log("Exit the game");
+#if UNITY_EDITOR
+        UnityEditor.EditorApplication.isPlaying = false;
+#else
+        Application.Quit();
+#endif
+    }
+}
diff --git a/302/Assets/Scripts/PauseManager.cs.meta b/302/Assets/Scripts/PauseManager.cs.meta
new file mode 100644
index 0000000..992d3c3
--- /dev/null
+++ b/302/Assets/Scripts/PauseManager.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: ca352e3a141129743824a83b5d7a231f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/302/Assets/Scripts/SpecificAnomalyManager/Anomaly15_spider.cs b/302/Assets/Scripts/SpecificAnomalyManager/Anomaly15_spider.cs
index f612da5..eeb7f63 100644
--- a/302/Assets/Scripts/SpecificAnomalyManager/Anomaly15_spider.cs
+++ b/302/Assets/Scripts/SpecificAnomalyManager/Anomaly15_spider.cs
@@ -10,9 +10,13 @@ public class Anomaly15_spider : AbstractAnomalyInteractable
     private Transform cameraTransform;
     private AudioSource audioSource;
 
-    private void Start()
+    protected override bool Start_()
     {
+        bool res = base.Start_();
+
         StartAnomaly();
+
+        return res;
     }
 
     public override bool StartAnomaly()
diff --git a/302/Assets/Scripts/SpecificAnomalyManager/Anomaly16_marker.cs b/302/Assets/Scripts/SpecificAnomalyManager/Anomaly16_marker.cs
index b04d613..525ace7 100644
--- a/302/Assets/Scripts/SpecificAnomalyManager/Anomaly16_marker.cs
+++ b/302/Assets/Scripts/SpecificAnomalyManager/Anomaly16_marker.cs
@@ -62,9 +62,13 @@ public override bool StartAnomaly()
         return true;
     }
 
-    private void Start()
+    protected override bool Start_()
     {
+        bool res = base.Start_();
+
         StartAnomaly();
+
+        return res;
     }
 
     public override bool ResetAnomaly()
diff --git a/302/Assets/Scripts/SpecificAnomalyManager/Anomaly17_mic.cs b/302/Assets/Scripts/SpecificAnomalyManager/Anomaly17_mic.cs
index 3c3d6b5..24b6985 100644
--- a/302/Assets/Scripts/SpecificAnomalyManager/Anomaly17_mic.cs
+++ b/302/Assets/Scripts/SpecificAnomalyManager/Anomaly17_mic.cs
@@ -62,9 +62,13 @@ public override bool StartAnomaly()
         return true;
     }
 
-    private void Start()
+    protected override bool Start_()
     {
+        bool res = base.Start_();
+
         StartAnomaly();
+
+        return res;
     }
 
     public override bool ResetAnomaly()
diff --git a/302/Assets/Scripts/SpecificAnomalyManager/Anomaly29_banana.cs b/302/Assets/Scripts/SpecificAnomalyManager/Anomaly29_banana.cs
index 75d0ae0..752b678 100644
--- a/302/Assets/Scripts/SpecificAnomalyManager/Anomaly29_banana.cs
+++ b/302/Assets/Scripts/SpecificAnomalyManager/Anomaly29_banana.cs
@@ -7,7 +7,7 @@ public class Anomaly29_banana : MonoBehaviour
 
     void Start()
     {
-       anomalyManager = FindObjectOfType<Anomaly29Controller>();
+        anomalyManager = FindObjectOfType<Anomaly29Controller>();
     }
 
     private void OnCollisionEnter(Collision collision)
diff --git a/302/Assets/Scripts/SpecificAnomalyManager/Anomaly30_window.cs b/302/Assets/Scripts/SpecificAnomalyManager/Anomaly30_window.cs
index 2761889..e8d7fb4 100644
--- a/302/Assets/Scripts/SpecificAnomalyManager/Anomaly30_window.cs
+++ b/302/Assets/Scripts/SpecificAnomalyManager/Anomaly30_window.cs
@@ -23,9 +23,13 @@ public class Anomaly30_window : AbstractAnomalyInteractable
     private AudioSource audioSource;
     private static GameObject coroutineRunner;
 
-    private void Start()
+    protected override bool Start_()
     {
+        bool res = base.Start_();
+
         StartAnomaly();
+
+        return res;
     }
 
     public override bool StartAnomaly()