Book Space Invaders
Move your base left or right to shoot the endless waves of aliens marching towards earth. There are four buildings (shields) that you can hide behind, but eventually they will be destroyed either by enemy missiles or by the enemies themselves. The aliens’ descent quickens as you eliminate them. Shoot the flying saucer for extra points. See the “FURRER” trick for information on receiving 300pts every time you hit the saucer.