Intruders

Space Intruders is a clone of the popular arcade game Space Invaders for the BBC Micro, where the object is to navigate your ship left or right, using its built-in laser fire to destroy five rows of aliens who work their way down towards you. If any of these aliens make contact with the ship, a life will be lost. Four bases are there to protect your ship, but these bases can be destroyed piece by piece. From time to time, a UFO will make its way across the screen; and shooting it will award you with bonus points. The game ends when all lives have been lost.