diff --git a/src/main/java/JumpGame.java b/src/main/java/JumpGame.java
index 1004826..344a7a1 100644
--- a/src/main/java/JumpGame.java
+++ b/src/main/java/JumpGame.java
@@ -22,9 +22,8 @@
     //---------------------------------------------------------------
     // 初期化
     public void init() {
-        JumpGameModel jumpGameModel = (JumpGameModel)model;
         // view
-        views.add(new TileMapRenderer(jumpGameModel.getFlags().getValues()));
+        views.add(new TileMapRenderer(model));
         views.add(new PlayerRenderer("resources/chicken.png"));
     }
 
@@ -38,6 +37,8 @@
             view.display();
         }
 
+
+
         // Modelの更新
         //
         // Space キーのインプット
diff --git a/src/main/java/entities/Ground.java b/src/main/java/entities/Ground.java
index 58ab6f6..619b2cf 100644
--- a/src/main/java/entities/Ground.java
+++ b/src/main/java/entities/Ground.java
@@ -1,9 +1,26 @@
 package entities;
 
 public class Ground {
-    private boolean value;
+    private boolean value = true;
 
+    //---------------------------------------------------------------
+    // getter
     public boolean getValue() {
         return value;
     }
+
+    //---------------------------------------------------------------
+    //---------------------------------------------------------------
+    //
+    public void openHole(){
+        this.value = false;
+    }
+
+    //---------------------------------------------------------------
+    //
+    public void closeHole(){
+        this.value = true;
+    }
+
+    //---------------------------------------------------------------
 }
\ No newline at end of file
diff --git a/src/main/java/entities/Position.java b/src/main/java/entities/Position.java
index fbafd51..7c23683 100644
--- a/src/main/java/entities/Position.java
+++ b/src/main/java/entities/Position.java
@@ -7,7 +7,7 @@
 //
 public class Position {
     private Ground ground;
-    private Pair<Double> value = new Pair<>(-20d, 0d);
+    private Pair<Double> value = new Pair<>(-4d, 0d);
 
     //---------------------------------------------------------------
     //---------------------------------------------------------------
diff --git a/src/main/java/entities/modelExtentions/Flags.java b/src/main/java/entities/modelExtentions/Flags.java
index a4c0f79..e904fcb 100644
--- a/src/main/java/entities/modelExtentions/Flags.java
+++ b/src/main/java/entities/modelExtentions/Flags.java
@@ -11,6 +11,7 @@
 public class Flags {
 
     private ArrayList<Integer> values = new ArrayList<>();
+    private int count = 0;
 
     //---------------------------------------------------------------
     //---------------------------------------------------------------
@@ -23,6 +24,7 @@
 
             for (int i = 0; i < lines.size(); i++) data = lines.get(i).split(",");
             for (int i = 0; i < data.length; i++) values.add(Integer.parseInt(data[i]));
+            for (int v : values) System.out.println(v);
 
         } catch (IOException e) {
             System.out.println("Failed to load stage.txt");
@@ -35,5 +37,38 @@
     public ArrayList<Integer> getValues() {
         return values;
     }
+
     //---------------------------------------------------------------
+    //---------------------------------------------------------------
+    // フラグのタイミングと一致しているかをチェック
+    public boolean isFlag(int timing) {
+        for (int flag : values)
+            if (timing == flag) return true;
+        return false;
+    }
+
+    //---------------------------------------------------------------
+    // 奇数番目のフラグで穴を開けるフラグを提示する
+    public boolean isOpenFlag(int x) {
+
+        if (count % 2 != 0) return false;
+
+        if (values.get(count) <= x) {
+            count++;
+            return true;
+        }
+        return false;
+    }
+
+    //---------------------------------------------------------------
+    // 偶数番目のフラグで穴を閉じるフラグを提示する
+    public boolean isCloseFlag(int x) {
+        if (count % 2 == 0) return false;
+        if (values.get(count) <= x) {
+            count++;
+            return true;
+        }
+        return false;
+    }
+
 }
diff --git a/src/main/java/models/JumpGameModel.java b/src/main/java/models/JumpGameModel.java
index 58ad441..6c730b9 100644
--- a/src/main/java/models/JumpGameModel.java
+++ b/src/main/java/models/JumpGameModel.java
@@ -3,6 +3,7 @@
 import entities.*;
 import entities.modelExtentions.Flags;
 
+import javax.swing.plaf.synth.SynthTextAreaUI;
 import java.io.IOException;
 import java.nio.charset.Charset;
 import java.nio.file.Files;
@@ -87,9 +88,21 @@
     public void updateGravity(double gravity) {
         this.time.gravity(gravity);
         this.force.gravity(gravity);
+        updateGroundFlag();
 //        System.out.println("swapWindow Gravity");
     }
 
+    //---------------------------------------------------------------
+    //
+    public void updateGroundFlag() {
+        int x = position.getValue().getFirst().intValue();
+
+        if (flags.isOpenFlag(x)) ground.openHole();
+        if (flags.isCloseFlag(x)) ground.closeHole();
+
+        System.out.print("x: " + x + "/");
+        System.out.println("Ground: " + ground.getValue());
+    }
 
     //---------------------------------------------------------------
     //
diff --git a/src/main/java/views/TileMapRenderer.java b/src/main/java/views/TileMapRenderer.java
index 677531d..ea57f3a 100644
--- a/src/main/java/views/TileMapRenderer.java
+++ b/src/main/java/views/TileMapRenderer.java
@@ -1,7 +1,9 @@
 package views;
 
 import entities.Pair;
+import entities.modelExtentions.Flags;
 import models.IModel;
+import models.JumpGameModel;
 
 import java.util.ArrayList;
 
@@ -15,8 +17,9 @@
 
     //---------------------------------------------------------------
     //---------------------------------------------------------------
-    public TileMapRenderer(ArrayList<Integer> flags) {
-        initTiles(flags);
+    public TileMapRenderer(IModel model) {
+        JumpGameModel jumpGameModel = (JumpGameModel) model;
+        initTiles(jumpGameModel.getFlags());
     }
 
     //---------------------------------------------------------------
@@ -45,24 +48,24 @@
     //--------------------------------------------------------------
     //---------------------------------------------------------------
     // 初期タイル作成
-    private void initTiles(ArrayList<Integer> flags) {
+    private void initTiles(Flags flags) {
         boolean isOpen = false;
         int space = 20;
 
+        // タイルマージン
         for (int i = 0; i < space; i++) {
             double x = 32 * newTile.getScaleValue() * i;
-            addNewTile(x, TileType.CLOSE);
+            if (i == 12) addNewTile(x, TileType.OPEN);
+            else addNewTile(x, TileType.CLOSE);
         }
 
         for (int i = 0; i < 100; i++) {
             double x = 32 * newTile.getScaleValue() * (i + space);
+
             // フラグのチェック
-            System.out.println(isFlag(i, flags));
+            if (flags.isFlag(i)) isOpen = !isOpen;
 
-            if (isFlag(i, flags)) {
-                isOpen = !isOpen;
-            }
-
+            // タイルの切り替え
             if (isOpen) addNewTile(x, TileType.OPEN);
             else addNewTile(x, TileType.CLOSE);
 
@@ -86,12 +89,4 @@
     }
 
     //---------------------------------------------------------------
-    //---------------------------------------------------------------
-    // フラグのタイミングと一致しているかをチェック
-    private boolean isFlag(int timing, ArrayList<Integer> flags) {
-        for (int flag : flags)
-            if (timing == flag) return true;
-        return false;
-    }
-    //---------------------------------------------------------------
 }
\ No newline at end of file