public void OnApplicationQuit()
 {
     PlayerPrefs.SetString("AncientTime", System.DateTime.Now.ToString());
     for (int i = 0; i < nbGuard; i++)
     {
         string g = "guard" + i.ToString();
         PlayerPrefs.SetInt(g, guardActive [i]);
     }
     PlayerPrefs.SetInt("LifeGuard", Mathf.Abs(gm.GetLifeGuard() - gm.GetBaseLife()));
     PlayerPrefs.SetFloat("VolumeMusic", sm.GetVolume(0));
     PlayerPrefs.SetFloat("VolumeEffect", sm.GetVolume(1));
     PlayerPrefs.SetInt("LastScore", GetComponent <ScoreManager>().GetScore());
 }