Spy vs. Spy was a game first published by First Star Software in 1984 for the Atari 8-bit family, Commodore 64 and Apple II computers. It was an innovative two-player, split-screen game, based on MAD Magazine's long running cartoon strip, Spy vs. Spy, about the slapstick antics of two spies trying to kill each other with improbably complex and elaborate traps and weapons.
It is perhaps the first video game to implement split-screen simultaneous two-player gameplay, as it was commercially released before Pitstop II, another early video game with a similar split-screen display.[source:wikipedia]