Invaders 1978 is a clone of the arcade game Space Invaders, which involved players shooting at waves of invaders that would drop bombs and make their way down the screen towards players' laser bases. A high-scoring U. F. O. will come out during waves as well.
300 point U. F. O.
There is way to score 300 points with every time the U. F. O. is shot.
What to do
Fire 22 shots during a wave, then hit the U. F. O. on the 23rd shot, then on every 15th shot thereafter to score 300 points every time.