Invader From Space

From manual (Epoch release) Object of the Game It's an invasion from Outer Space and you must defend your missile bases on Earth from the computer-controlled space invader attack. You have five missile bases and five chances to launch a counterattack. Watch out, here hey come. Fire. It's a game of speed as well as skill. If the invaders reach the Earth's atmosphere, the game is over even if you have missile bases left.