Alien Invaders (1982)

Game manual Your city and 6 missile launchers are under attack by 70 "invaders" who were launched by their "MOTHER SHIPS". The object of the game is to shoot down ALL THE INVADERS & THE MOTHER SHIPS before they destroy your missile launchers. You have 5 minutes of accelerated computer time showing (actual time is approx. 3 minutes) to accomplish this task. At the end of the game your score will appear at the top of the screen. It will remain in the computer memory as "HI" score until someone "beats" it. The next Higher Score will automatically replace it. This game can be played by as many consecutive players as desired.