30 years ago this month, Nintendo released Donkey Kong — an iconic arcade machine that put the company on the video game map and introduced Mario. Technologizer's Benj Edwards celebrated the anniversary by rounding up some of the game's odder sidelights. For instance, it was originally going to be a game about Popeye, Bluto, and Olive Oyl — and among its stranger offshoots was a pocket-sized game in which Donkey Kong and Mario faced off in hockey."
Gamasutra has a more detailed article about the game's development.