Click anywhere on the screen towards the flag. The orange barrier will stop the ball, and the ball will go back to the green line. The X's will stop the ball too, but you will get minus a point. Then, the ball will go back to the green line. The ball will stop moving when it touches the green line. The ball will bounce if it touches the wall. If the ball touches the green flag, the green flag will change its position. It's the same with the X's.