You control a cannon placed on top of the screen. There are also many blue and red balls on the screen and you have to shoot and destroy all red balls to win each level. You can also destroy the blue ones to earn more score, but the main goal are the red ones. Also there is a moving platform with a hole in it at bottom of the screen and if the ball that you have shot enters it, you will earn extra ball or shot. Otherwise, it will fall and you will lose one shot. You will lose if you run out of shots, so count them.