diff --git a/src/main/java/src/GameField.java b/src/main/java/src/GameField.java
index 653f516..01e3bea 100644
--- a/src/main/java/src/GameField.java
+++ b/src/main/java/src/GameField.java
@@ -122,8 +122,14 @@ public class GameField extends JPanel {
     public void setValue(int x, int y, int value) {
 
         JLabel jLabel = gameField[y][x].getjLabel();
-        jLabel.setText(String.valueOf(value));
-        jLabel.setVisible(true);
+
+        if (value <= 0) {
+            jLabel.setText("0");
+            jLabel.setVisible(false);
+        } else {
+            jLabel.setText(String.valueOf(value));
+            jLabel.setVisible(true);
+        }
 
     }
 
diff --git a/src/main/java/src/MainFrame.java b/src/main/java/src/MainFrame.java
index f9b2d7c..98378ee 100644
--- a/src/main/java/src/MainFrame.java
+++ b/src/main/java/src/MainFrame.java
@@ -19,6 +19,8 @@ public class MainFrame extends JFrame {
 
     private JSONArray currentGameDifficulty;
     private Model currentModel;
+    private JLabel currentGameLabel;
+    private int currentPosition;
 
     public void run() {
 
@@ -79,10 +81,37 @@ public class MainFrame extends JFrame {
 
         JButton back = new JButton();
         back.setVisible(true);
-        back.setBounds(5, 5, 100, 25);
+        back.setBounds(120, 525, 100, 25);
         rootPanel.add(back);
         back.setText("Back");
 
+        currentGameLabel = new JLabel();
+        currentGameLabel.setVisible(true);
+        currentGameLabel.setBounds(250, 525, 40, 25);
+        currentGameLabel.setText("0/0");
+        rootPanel.add(currentGameLabel);
+
+        JButton next = new JButton();
+        next.setVisible(true);
+        next.setBounds(280, 525, 100, 25);
+        rootPanel.add(next);
+        next.setText("Next");
+        next.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+
+                if (currentPosition+1 < currentGameDifficulty.size()) {
+                    currentPosition++;
+                } else {
+                    currentPosition = 0;
+                }
+                JSONObject jsonObject = (JSONObject) currentGameDifficulty.get(currentPosition);
+                loadDataToGameField(jsonObject);
+
+                currentGameLabel.setText((currentPosition+1)+"/"+currentGameDifficulty.size());
+            }
+        });
+
         JButton newButton  = new JButton();
         newButton.setVisible(true);
         newButton.setBounds(395, 5, 100, 25);
@@ -206,11 +235,46 @@ public class MainFrame extends JFrame {
                 }
                 currentGameDifficulty = (JSONArray) object.get("easyGame");
                 loadDataToGameField((JSONObject) currentGameDifficulty.get(0));
+                currentPosition = 0;
+                currentGameLabel.setText((currentPosition+1)+"/"+currentGameDifficulty.size());
             }
         });
 
         JMenuItem menu_i5=new JMenuItem("Mittel");
+        menu_i5.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                String data = Model.loadAllData();
+                JSONObject object = null;
+                try {
+                    object = (JSONObject)new JSONParser().parse(data);
+                } catch (ParseException ex) {
+                    throw new RuntimeException(ex);
+                }
+                currentGameDifficulty = (JSONArray) object.get("mediumGame");
+                loadDataToGameField((JSONObject) currentGameDifficulty.get(0));
+                currentPosition = 0;
+                currentGameLabel.setText((currentPosition+1)+"/"+currentGameDifficulty.size());
+            }
+        });
+
         JMenuItem menu_i6=new JMenuItem("Schwer");
+        menu_i6.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                String data = Model.loadAllData();
+                JSONObject object = null;
+                try {
+                    object = (JSONObject)new JSONParser().parse(data);
+                } catch (ParseException ex) {
+                    throw new RuntimeException(ex);
+                }
+                currentGameDifficulty = (JSONArray) object.get("hardGame");
+                loadDataToGameField((JSONObject) currentGameDifficulty.get(0));
+                currentPosition = 0;
+                currentGameLabel.setText((currentPosition+1)+"/"+currentGameDifficulty.size());
+            }
+        });
 
         m_menu.add(menu_i1);
         m_menu.add(menu_i2);
diff --git a/src/main/java/src/Model.java b/src/main/java/src/Model.java
index 66c659a..0cd35fb 100644
--- a/src/main/java/src/Model.java
+++ b/src/main/java/src/Model.java
@@ -207,7 +207,7 @@ public class Model {
                 JSONObject jsonObject = new JSONObject();
                 jsonObject.put("x", j);
                 jsonObject.put("y", i);
-                jsonObject.put("value", getField(i, j));
+                jsonObject.put("value", getField(j, i));
                 values.add(jsonObject);
 
             }
diff --git a/src/main/java/src/SandboxFrame.java b/src/main/java/src/SandboxFrame.java
index 4fffa86..5a9ded2 100644
--- a/src/main/java/src/SandboxFrame.java
+++ b/src/main/java/src/SandboxFrame.java
@@ -23,7 +23,6 @@ public class SandboxFrame extends JFrame {
         this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
 
         setupLayout();
-
     }
 
     private void setupLayout() {
@@ -58,6 +57,7 @@ public class SandboxFrame extends JFrame {
     }
 
     private JButton setupSaveButton() {
+
         JButton save = new JButton("Save");
         save.setVisible(true);
 
@@ -72,6 +72,7 @@ public class SandboxFrame extends JFrame {
 
             }
         });
+
         return save;
     }
 
diff --git a/src/test/java/ModelTest.java b/src/test/java/ModelTest.java
index b8fe6ba..f4af955 100644
--- a/src/test/java/ModelTest.java
+++ b/src/test/java/ModelTest.java
@@ -46,6 +46,7 @@ public class ModelTest extends MainFrame {
                 "8 |  8 8 8   8 8 8   8 8 8\n";
 
 
+
         assertEquals(model.toString(), staticCase, "tested Overridden toString of Model.class");
     }
 
@@ -247,7 +248,7 @@ public class ModelTest extends MainFrame {
         GameField gameField = new GameField(360);
         for (int i = 0, k = 13; i < 9; i++) {
             for (int j = 0, l = 17; j < 9; j++) {
-                gameField.setValue(i, j, (i*l+j*k)%9);
+                gameField.setValue(j, i, (i*l+j*k)%9);
             }
         }
         Model model = new Model(gameField);
@@ -273,7 +274,7 @@ public class ModelTest extends MainFrame {
         GameField gf = new GameField(360);
         for (int i = 0, k = 13; i < 9; i++) {
             for (int j = 0, l = 17; j < 9; j++) {
-                gf.setValue(i, j, (i*l+j*k)%9);
+                gf.setValue(j, i, (i*l+j*k)%9);
             }
         }
         Model m = new Model(gf);