is a 1982
arcade-style
platform video game by
Nintendo. It first appeared in arcades, and, over the course of the 1980s, was later released for a variety of platforms, most notably the
Nintendo Entertainment System. The game's title is written out as
Donkey Kong Junior in the North American arcade version and various ports to non-Nintendo systems. Its eponymous star, Donkey Kong Jr., also called simply Junior or abbreviated as DK Jr., is trying to rescue his father
Donkey Kong, who has been imprisoned. Donkey Kong's cage is guarded by
Mario, in his only appearance as an antagonist in a Nintendo video game. This game is the sequel to the video game
Donkey Kong, which featured Mario as the hero and Junior's father as the villain (while in this game, it's the other way around).