The screen is a ball painted with planets. You will control the ball at the bottom of the screen to move left and right with the arrow buttons on the screen so that the ball can eat other balls of the same shape and size as it to get 1 point. and increase the size of the ball, can also eat a non-zero ball with it if the ball size is smaller than yours to earn points but not increase the ball size. If you eat a ball that is bigger than your size or the same size but different type then you lose.