diff --git a/Assets/Black.mat b/Assets/Black.mat
index b857a1ac..cbb2e281 100644
--- a/Assets/Black.mat
+++ b/Assets/Black.mat
@@ -79,5 +79,5 @@ Material:
     - _ZWrite: 1
     m_Colors:
     - _Color: {r: 1, g: 1, b: 1, a: 1}
-    - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}
+    - _EmissionColor: {r: 1, g: 1, b: 1, a: 1}
   m_BuildTextureStacks: []
diff --git a/Assets/BuildingParent.cs b/Assets/BuildingParent.cs
index a26e006c..4d1c269b 100644
--- a/Assets/BuildingParent.cs
+++ b/Assets/BuildingParent.cs
@@ -40,6 +40,8 @@ public class BuildingParent : MonoBehaviour
     [ContextMenu("Func")]
     public void Func()
     {
+        //if (InstantiatedObstacle != null)
+        //    Destroy(InstantiatedObstacle);
         for (int i = 0; i < 10; i++)
         {
             Building temp = Instantiate(buildingObj, transform);
@@ -55,7 +57,7 @@ public class BuildingParent : MonoBehaviour
                     temp.renderers[j].material = Buildingmaterials[rand];
                 }
             }
-            if (percentAgeObstacle < 30)
+            if (percentAgeObstacle < 80)
             {
                 InstantiatedObstacle = Instantiate(obstacleObj, temp.transform);
             }
@@ -68,9 +70,10 @@ public class BuildingParent : MonoBehaviour
         int temp = counter % BuildingPool.Count;
         BuildingPool[temp].transform.localPosition = new Vector3(0, 0, -100 - (10 * counter));
         counter++;
-        Destroy(InstantiatedObstacle);
+        if (InstantiatedObstacle != null)
+            Destroy(InstantiatedObstacle.gameObject);
         int percentAgeObstacle = Random.Range(0, 100);
-        if (percentAgeObstacle < 20)
+        if (percentAgeObstacle < 80)
             InstantiatedObstacle = Instantiate(obstacleObj, BuildingPool[temp].transform);
 
         int percentAge = Random.Range(0, 100);
diff --git a/Assets/GameManager.cs b/Assets/GameManager.cs
new file mode 100644
index 00000000..27fdc970
--- /dev/null
+++ b/Assets/GameManager.cs
@@ -0,0 +1,39 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+public enum DifficultyLevel
+{
+    easy, medium, hard,
+}
+public class GameManager : MonoBehaviour
+{
+    public DifficultyLevel difficultyLevel;
+    public List<int> difficultyScores;
+    public float Score; 
+    public static GameManager instance;
+    public bool isGameOver = false;
+
+    public void Awake()
+    {
+        instance = this;
+    }
+    private void Start()
+    {
+        StartCoroutine(ScoreUpdateRoutine());
+    }
+    IEnumerator ScoreUpdateRoutine()
+    {
+        difficultyLevel = DifficultyLevel.easy;
+        while (!isGameOver)
+        {
+            Score++;
+            UIManager.instance.ScoreText.text = Score.ToString();
+            if(Score > difficultyScores[(int)difficultyLevel] && (int)difficultyLevel< difficultyScores.Count-1)
+            {
+                difficultyLevel++;
+            }
+            Debug.Log("difficulty Level: " + (int)difficultyLevel);
+            yield return new WaitForSeconds(1);
+        }
+    }
+}
diff --git a/Assets/GameManager.cs.meta b/Assets/GameManager.cs.meta
new file mode 100644
index 00000000..816b205d
--- /dev/null
+++ b/Assets/GameManager.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 7e82af5507a3f3745885b4e14a26d858
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Green.mat b/Assets/Green.mat
index 8480c790..4a31459c 100644
--- a/Assets/Green.mat
+++ b/Assets/Green.mat
@@ -78,6 +78,6 @@ Material:
     - _UVSec: 0
     - _ZWrite: 1
     m_Colors:
-    - _Color: {r: 1, g: 1, b: 1, a: 1}
+    - _Color: {r: 0.11969948, g: 1, b: 0, a: 1}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}
   m_BuildTextureStacks: []
diff --git a/Assets/Obstacle.cs b/Assets/Obstacle.cs
index c836f898..c207c77c 100644
--- a/Assets/Obstacle.cs
+++ b/Assets/Obstacle.cs
@@ -4,14 +4,36 @@ using UnityEngine;
 
 public class Obstacle : MonoBehaviour
 {
-    public List<GameObject> obstacleObjs;
+    public List<GameObject> easyObstacleObjs;
+    public List<GameObject> mediumObstacleObjs;
+    public List<GameObject> hardObstacleObjs;
+
     private void Start()
     {
         Starter();
     }
     public void Starter()
     {
-        int rand=Random.Range(0, obstacleObjs.Count);
-        obstacleObjs[rand].gameObject.SetActive(true); 
+        List<GameObject> list = DifficultyList();
+        Debug.Log("list: " + list[list.Count-1].name);
+        int rand = Random.Range(0, list.Count);
+        list[rand].gameObject.SetActive(true);
+    }
+    List<GameObject> DifficultyList()
+    {
+        int difficultyLevel = (int)GameManager.instance.difficultyLevel;
+        return difficultyLevel == 0 ? easyObstacleObjs : difficultyLevel == 1 ? mediumObstacleObjs : hardObstacleObjs;
+        //if (difficultyLevel == 0)
+        //{
+        //    return easyObstacleObjs;
+        //}
+        //else if (difficultyLevel == 1)
+        //{
+        //    return mediumObstacleObjs;
+        //}
+        //else
+        //{
+        //    return HardObstacleObjs;
+        //}
     }
 }
diff --git a/Assets/Prefabs/Obstacle.prefab b/Assets/Prefabs/Obstacle.prefab
index 4e3295cc..92f2b405 100644
--- a/Assets/Prefabs/Obstacle.prefab
+++ b/Assets/Prefabs/Obstacle.prefab
@@ -1,5 +1,70 @@
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   m_Name: 
   m_EditorClassIdentifier: 
-  obstacleObjs:
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-  - {fileID: 1480047792977806050}
+  easyObstacleObjs:
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@@ -997,7 +1622,7 @@ GameObject:
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-  m_Name: v2 (4)
+  m_Name: E4
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@@ -1029,7 +1654,7 @@ GameObject:
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   m_Layer: 7
-  m_Name: v2 (6)
+  m_Name: M2
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   m_LocalRotation: {x: 0, y: 0, z: 0.38268343, w: 0.92387956}
-  m_LocalPosition: {x: 0.001, y: 1.765, z: 4.41}
+  m_LocalPosition: {x: 0.001, y: 1.765, z: 0}
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@@ -1179,7 +1804,7 @@ GameObject:
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-  m_Name: v2 (1)
+  m_Name: E1
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@@ -1211,7 +1836,7 @@ GameObject:
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   m_Layer: 7
-  m_Name: v2 (2)
+  m_Name: E2
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@@ -1243,7 +1868,7 @@ GameObject:
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   m_Layer: 7
-  m_Name: v1
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diff --git a/Assets/Scenes/SampleScene.unity b/Assets/Scenes/SampleScene.unity
index ab06cfb2..667b7f63 100644
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diff --git a/Assets/UIManager.cs b/Assets/UIManager.cs
index e7c5bdb2..d60182e0 100644
--- a/Assets/UIManager.cs
+++ b/Assets/UIManager.cs
@@ -10,8 +10,6 @@ public class UIManager : MonoBehaviour
     public CharacterController player;
     public GameObject GameOverPanel;
     public CameraFollow cameraFollow;
-    bool isGameOver = false;
-    float Score;
     public TextMeshProUGUI ScoreText;
     private void Awake()
     {
@@ -20,21 +18,11 @@ public class UIManager : MonoBehaviour
     private void Start()
     {
         UpdateHealth();
-        StartCoroutine(ScoreUpdateRoutine());
-    }
-    IEnumerator ScoreUpdateRoutine()
-    {
-        while(!isGameOver)
-        {
-            Score += Time.fixedDeltaTime;
-            ScoreText.text = Mathf.FloorToInt(Score).ToString();
-            yield return new WaitForSeconds(Time.fixedDeltaTime);
-
-        }
     }
+    
     public void UpdateHealth()
     {
-        if (!isGameOver)
+        if (!GameManager.instance.isGameOver)
         {
             if (player.Health <= 0)
             {
@@ -50,7 +38,7 @@ public class UIManager : MonoBehaviour
     }
     void GameOver()
     {
-        isGameOver = true;
+        GameManager.instance.isGameOver = true;
         Destroy(player.SpineHingeJoint);
         GameOverPanel.SetActive(true);
         cameraFollow.isPlaying = false;