@Override
	public void onBackPressed() {
		    if (mCurrentScene instanceof GameScene){
		        ((GameScene) mCurrentScene).detach();
		        setCurrentScene(new MainMenuScene());
			}
		    else if
		    	(mCurrentScene instanceof AboutScene){
			    ((AboutScene) mCurrentScene).detach();
			     setCurrentScene(new MainMenuScene());
		    }
		    else if
	    	(mCurrentScene instanceof MainMenuScene){
		    super.onBackPressed();
		    }
		    else {
		    	mCurrentScene = null;
		    	SensorListener.instance = null;
		    }

		}