Loosely based on the tank portion of the Atari 2600 cart that originally came packed with the console, Combat brings tank warfare into 3D. There is both a single player mode, in which the player must advance through 30 levels, and multi-player mode, which allows deathmatch style play.
Just as in the Atari 2600 game, the tanks' turrets do not turn. However, the tanks turn quicker and hover, rather than relying on treads. This allows them to slide left and right, as well as forward and back.
In single player mode, the player must find the exit in each level to advance. The levels range from the simple "shoot and destroy until the exit appears" to the complicated "journey back and forth destroying the enemies required to open gates." There are also levels in which a "boss" must be defeated to advance.
Multiplayer mode supports play over a LAN or the Internet. The CD-ROM also includes the GameSpy Arcade software if you wish to use it for Internet play.
The CD-ROM also includes a map editor, although it is officially unsupported.
Included in the "Goodies" folder on the CD-ROM is the Stella Atari 2600 emulator and ROM images of both Combat and Combat Two. The latter was never commercially released, but is a prototype unearthed in 2001.