Exterminate

Exterminate is an action game for one or two players.

The world is counting on you to annihilate a horde of alien bugs that are trying to escape from an underground cavern. Your only weapons are your skill, strategy, and an armed "Rover".

The player controls a small vessel which can move underground and shoot in the 4 cardinal directions. Small alien bugs come crawling across the screen from the left to right, and the player must dig their way through the rock to destroy the aliens. The player is awarded points for aliens destroyed, but loses points should aliens make it across the screen. If they are hit by alien fire, they lose a rover. Three rovers lost, and it's game over.