Combat was the game cartridge that came with the original Atari 2600. The cartridge had 27 separate video games including Tank in which you drive a tank and try to shoot your opponent, Biplane in which you fly a biplane and try to shoot your opponent, Jet Fighter in which you fly a jet airplane and try to shoot your opponent and Invisible Tank in which you drive an invisible tank and try to shoot your opponent.
Quake it wasn't.
Trivia: Originally, the Combat was
supposed to be soldered right into the Atari 2600
instead of a separate cartridge. I don't know why
it didn't happen. Probably Atari wanted to eliminate
the extra expense to detect and switch between a
cartridge and the internal game.