Prisoners’ Dilemma is a two-player game played across the Internet. It implements the “two-button controls” theme. When two players are present, they are automatically placed in a prison together. The only way that they can communicate with each other is by knocking on the wall that separates their cells (using the K key on the keyboard). They can also attempt to escape (with the D key), but will be killed in the attempt unless they synchronize their attacks and each take down a guard. The difficulty of the game, then, comes from the fact that it’s quite hard to synchronize an attack when you have no means of communication other than knocking on a wall. (NOTE: There's no AI in this game; you really are communicating with another person!)