BallRebound descriptions How to play. Periodically moving balls appear on the bottom of the field. You have to direct them to the target. Ways to control the balls: 1} draw the walls for the balls to bounce off or 2} catch a ball with a stylus & push it in the desired direction. The ball hitting the target earns you 10 points the ball hitting an obstacle 2 points. The color of a ball determines its behavior at the impact. To pass a level you have to get 90% of the maximum possible points. There are 50 levels. Levels editor included!