Your mission is to defend your six command posts and your home base against the on-coming interballistic missiles. You control the missile sight with your joystick. On pressing the fire button you launch a missile which, if it detonates in the path of the oncoming missile, will blow it up.
You score points depending on the number of missiles destroyed and bases remaining.
Wave after wave of missiles come at you, the come the dreaded fusion bombs which can home into your bases.
Joysticks required. Full instructions given in the program.