Slot Machine
Slot Machine is a 1979 Atari 2600 cartridge that turns the console into a three-reel casino slot machine. It was programmed by David Crane, who later co-founded Activision, and Sears sold it under the name Slots. There is no real money involved, of course: you and a friend, or you and the computer, try to keep your coins longer than the other side. You can play it here in your browser.