Positron

A Space Invaders variant. The first wave follows the typical gameplay, but the second wave move about without a set pattern, and they set up defensive boxes which must be broken up quickly. There are nine waves in all, after which the mothership must be destroyed in order to advance to the next level.

You begin with three lives. A life is lost if you are hit or if the enemy gets past your craft. A life is gained for each 100,100 points scored.