Combat (Atari 2600, 1977)

The Tank game in Combat had the basis of two tanks controlled by players each moving around a playing field and shooting the other player until time ran out. The player with the higher score would win. There were various types of shots a player could have depending on which level they chose, including straight missiles, guided missiles, and Tank Pong in which the shots would bounce off the walls, with variations upon whether a direct hit could strike their opponent, or a strike required a billiard hit. There was also an Invisible Tank in which the players would be invisible except for a brief few seconds after firing, and Invisible Tank Pong option. Along with the play styles there were also mazes to choose from including an empty field, a simple maze and a complex maze.

One notable (and perhaps unintentional) interaction that could be performed in the tank game consisted of bringing one tank up behind the opponent tank such that the cannon of the first was inserted into the rear cutout of the second. Once in this position, by rotating the first tank, a sprite collision could be triggered which would send the tanks into a wild "jump", during which they usually would pass through obstacles, or leave the edge of the screen to enter on the other side.