public void resetDemo()
    {
        entities.removeAll(Entity.class);
        
        createBorders();
        
        for (int i = 0; i < 10; i++)
            createAndPositionToFreeSpot(new Ball());

        for (int i = 0; i < Const.cheeseamount; i++)
            createAndPositionToFreeSpot(new Cheese());
        
        if (menu != null)   menu.popMenu(true);
    }