The objective is to score as many points as possible by making balls of one color form various lines. Use the touch to move the balls. First select the ball to be moved, then an empty destination square. If the destination square is occupied by another ball, that ball is now selected to be moved . Note that you cannot always place the ball where youd want to. After you move a ball, three more appear, except when you formed a line. The more balls in a shape, the more points you score for making it.
Try the game now. Have fun!