You must fight with a number of alien ships who will be continuously firing at you. The enemies will outnumber you by at least a thirty times but you should stay put and fight them with your speed and efficient firing. Keep firing at them till every enemy has been destroyed. Stay away from the firing of the enemies and always keep firing to win. The number of enemies and their speed increases as you move up every level. You will have to use the arrow keys to move and the Space Bar to fire at the enemies.