Donkey Kong
Donkey Kong for the Atari 2600 is Coleco’s 1982 conversion of Nintendo’s 1981 arcade game, designed and programmed by Garry Kitchen. As Mario, you climb sloping girders and dodge barrels to rescue a girl kidnapped by the giant ape. It keeps only two of the arcade’s four screens, but it gets the barrel-jumping right, and it was one of the most common cartridges of its day. You can play it here in your browser, with nothing to install.