Donkey Kong is a spin-off of the 1981 arcade game developed by Nintendo, that features Donkey Kong as the main protagonist and Mario as the antagonist. Mario has kidnapped Donkey Kong's girlfriend Pauline, and Donkey Kong tries to rescue her. In this game, Donkey Kong can get the invincibility hammer to destroy fire balls and barrels, which are obstacles that he must jump over having not obtained this power-up. There are three levels. In the third level, Donkey Kong needs to find all the bolts to pull out of the construction site and make Mario fall down, landing on his head. This defeats Mario. In all the other levels, Donkey Kong must climb ladders to progress through the level, and make it to the top.