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 and "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.