Donkey Kong Junior

Donkey Kong Junior is the direct sequel to Donkey Kong. In this game, Mario plays the antagonist, finally having captured Donkey Kong, and has put the ape in a locked cage. As Donkey Kong Jr., players will have to make their way through four different levels (Vines, Springboard, Chains and Mario's Hideout) in an attempt to find keys to free the little monkey's father.

After the events of Donkey Kong, Mario has captured Donkey Kong as revenge for kidnapping his lady friend and Donkey Kong Jr. has to save him. However, every time Donkey Kong Jr. gets close to freeing his father, Mario just pushes him further away.