A little while ago I saw a message from
Joe Magiera about this early 80's two-player remake of Missile Command.
You can read the whole thing, though here's the part
describing Missile command 2:
In the early '80s there was a test prototype of a 2-ended MISSILE COMMAND, in a cabinet like an elevated cocktail game you would stand at each end of. The screen was oriented longwise, the planes & satellites came out from the middle, and enemy fire was sent down in both directions to cities at each end of the screen. You had to concentrate on your own cities first, of course, but if you killed the current wave and had rockets left, you could help the other player by launching against enemy fire threatening *his* cities!
Information from
Atari Documents Page: