The solar system is under attack from a swam of alien invaders, and you have to use your light gun to fight them off! This is probably the most challenging game on the tape, because you have to shoot the alien mothers (no, no, I didn't mean it like that: the big aliens which produce more little ones!) millions of times to kill them, and the little aliens are so small, you have to be really accurate with the shooting. Nonetheless it's quite playable and averagely addictive.