You are in command of a spaceship and your mission is to shoot and dodge your way through an endless asteroid belt. To stay alive, you must blow up the huge floating asteroids before they hit your spaceship. Beware. When you shoot a large asteroid, it breaks into two medium-sized asteroids. When you shoot a medium-sized asteroid, it breaks into two small asteroids.
Fortunately, when you shoot a small asteroid, it disintegrates. Keep an eye open for large flying saucers and small flying saucers. They shoot at you until you destroy them or until they collide with an asteroid.