Donkey Kong Junior
Donkey Kong Junior is the direct sequel to Donkey Kong. In this game, Mario plays the antagonist who eventually captured Donkey Kong and locked the monkey in a locked cage. In the role of Donkey Kong Jr., players must make their way through four different levels (vines, springboard, chains and Mario's lair) and try to find keys to free the little monkey's father.
Story
After the events of Donkey Kong, Mario has captured Donkey Kong to take revenge for kidnapping his girlfriend, and Donkey Kong Jr. must rescue him. But every time Donkey Kong Jr. is about to free his father, Mario just pushes him further away.