Pass 150 levels to finish the game. There is a picture made of balls at the center of the field. At the field edges – up, down, right and left – are located the balls to shoot with. Select any ball from the row closest to the field and clock on it. It will move along straight line until it bumps into another ball or the field edge. If, after that, the balls of the same color appear next to each other, they will disappear. Shoot to make all the balls on the field disappear.
On some levels you will come across brick walls. They can only be ruined by bombs or lightning. Bombs and lightning randomly appear among the balls meant to shoot with.
The game time is unlimited, but the complexity grows with the levels.