Galaga

Every third level is a "challenge stage" in which you have a free chance to shoot as many aliens as possible and rack up bonus points.

Certain 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, giving you both your final score and your final "hit ratio"--the number of missiles fired, enemies destroyed, and the percentage of targets hit.