With your Big Fat Lazer Cannon, defend Big Ma's House from the Little White Men. If the Little White Men reaches the end of the Screen it drops a Bomb on the defences of Big Ma's House, on the 4th Bomb Drop it's Game Over. Shoot the Little White Men with your Fine Lazer, but be careful because you only get 3 shots, it you shoot them your score is incremented and shots fire restored to 3, otherwise your number of shots is only restored after a Bomb is dropped.