Gameplay is rather simple. You are the Vac-Fighter on the screen, you can move up, down and back and forth (default - arrow). Everything coming at you from the top of the screen is hostile and can be shot with your cannons (default - command). Rebel ground forces can be taken out with your bombs. The cross hairs in front of your ship are the bomb sights, when they light up red, bombs away! (default - option). Collect power-ups and stars as they appear. Gain points and kudos. Liberate Mars from the forces of tyranny.