private void Awake()
 {
     SetUpSingleton();
     difficulty = SettingsPlayerPrefsManager.GetSavedDifficulty();
     mapSize    = SettingsPlayerPrefsManager.GetSavedMapSize();
 }
 public static void SaveDifficulty(GameValuesController.Difficulty difficulty)
 {
     PlayerPrefs.SetString(DIFFICULTY_PLAYERPREFS_KEY, difficulty.ToString());
 }