(Click To Enlarge)
Your mission - destroy all of the aliens, without getting shot yourself, or allowing a single alien to land on Earth, which results in your ship being destroyed. The tension mounts as the aliens dwindle in number, and both the speed of the remaining aliens increases, and also the tempo of the ominous 2 tone sound effect. Extra points could be gained by shooting the mother ship which appears occasionally across the top of the screen.
Have this all time favorite at your next event.