Galaga

The game has an infinite number of stages to progress through. Every third level is a "challenge stage" where you can shoot as many aliens as possible and rack up bonus points.

Some aliens have tractor beams they can use to capture one of your ships. If that wasn't your last "life," you can try to shoot that alien down and recapture your ship, giving you two ships at once and doubling your firepower.

A summary screen appears when the game is over, showing your final score and hit ratio--the number of missiles fired, enemies destroyed, and the percentage of targets hit.