A ball is moving inside the square.Each side of the square has a specific color. The ball is also colored with one of these colors. All you have to do is to make sure that the ball won’t hit the side with the same color and you can do this by touching the screen and changing the ball’s color. After each time that you change the ball’s color, it will also change the direction that it moves. You will lose if you fail to change the ball’s color correctly or if you change it when it’s not necessary.