Donkey Kong is an arcade game released by Nintendo in 1981. The game is an early example of the platform genre as the gameplay focuses on maneuvering the main character across a series of platforms while dodging obstacles. The storyline is thin but well developed for its time. In it, Mario (originally called Jumpman) must rescue a damsel in distress from a giant ape named Donkey Kong. Mario and Donkey Kong would go on to be two of Nintendo's more popular characters, the latter spawning the Donkey Kong Country series of games, originally developed by Rare (then known as Rareware) and later by Retro Studios after Rare was purchased by Microsoft.