Galaga

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

Certain aliens in the game can capture one of your ships using tractor beams. 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.