Combat

Came free with the Atari 2600 knockoff from Sears. Gets old fast and makes you wish the thing would also play Pong.

The first game developed for the 2600, and the pack-in for the system. Featuring numerous creative variations on the 2-player shooter matches of Atari's then-hot arcade title Tank (some of which instead involve planes). For a 2k cartridge developed while the system was still in prototype, not at all shabby. Going into bouncing bullet, invisible tank mode sort of works as a single player score challenge in a pinch.