its now possible to create a new game in sandbox whicht will be saved in our sudoku.json file

src/main/java/src/Model.java

@@ -100,7 +100,6 @@ public class Model {
 
     public static String loadAllData() {
 
-
         File file = new File("src/main/java/src/sudoku.json");
 
         if (file.exists()) {
@@ -110,6 +109,7 @@ public class Model {
                 throw new RuntimeException(e);
             }
         }
+
         String line = "";
         try {
             Scanner scanner = new Scanner(file);
@@ -120,6 +120,22 @@ public class Model {
         } catch (FileNotFoundException e) {
             throw new RuntimeException(e);
         }
+
+        if (line.equals("")) {
+            initJsonFile();
+        }
+
+        line = "";
+        try {
+            Scanner scanner = new Scanner(file);
+            while (scanner.hasNextLine()) {
+                line = line + scanner.nextLine();
+
+            }
+        } catch (FileNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+
         return line;
 
     }
@@ -155,18 +171,6 @@ public class Model {
         }
     }
 
-    public void loadNewMedium() {
-
-    }
-
-    public void loadNewHard() {
-
-    }
-
-    public void safeNewSandboxGame() {
-
-    }
-
     @Override
     public String toString() {
 
@@ -350,8 +354,46 @@ public class Model {
     }
 
     public void createNewGame(String difficulty) {
-        JSONObject jsonObject = modelToJson();
 
+        JSONObject myNewGame = modelToJson();
 
+        String s = loadAllData();
+
+        JSONObject object = null;
+        try {
+            object = (JSONObject) new JSONParser().parse(s);
+        } catch (ParseException e) {
+            throw new RuntimeException(e);
+        }
+
+        JSONArray easyArray = (JSONArray) object.get("easyGame");
+        JSONArray mediumArray = (JSONArray) object.get("mediumGame");
+        JSONArray hardArray = (JSONArray) object.get("hardGame");
+
+        System.out.println();
+
+        if (difficulty.equals("easy")) {
+
+            easyArray.add(myNewGame);
+
+        } else if (difficulty.equals("medium")) {
+
+            mediumArray.add(myNewGame);
+
+        } else if (difficulty.equals("hard")) {
+
+            hardArray.add(myNewGame);
+
+        }
+
+        String jsonString = object.toJSONString();
+
+        try {
+            FileWriter writer = new FileWriter("src/main/java/src/sudoku.json");
+            writer.write(jsonString);
+            writer.close();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
     }
 }