Donkey Kong Jr. (Game & Watch)

Donkey Kong Jr. is a Game & Watch revision of Donkey Kong Junior.

Story
Donkey Kong is captured by Mario, and Donkey Kong Jr. must save him.

Gameplay
Donkey Kong Jr. starts at the bottom of the screen, where he is immediately bombarded by Nitpickers and Snapjaws. After climbing a pair of vines to the second floor, a piece of fruit can be found, which can be dropped on enemies below for bonus points. After avoiding more Snapjaws, Donkey Kong Jr. must jump to the swinging key above, which he can use to unlock part of his father's cage. He will drop down, repeating the process. Once four keys are delivered, Donkey Kong is free, awarding a big bonus to the player. Along the way, Donkey Kong Jr. can also grab hold of vines above, which help in avoiding the ground-bound Snapjaws.

It was later duplicated for Game & Watch Gallery 3 and Game & Watch Gallery 4, along with its own modern version, featuring three levels complete with Goombas, Nipper Plants, Bullet Bills, and Spinies, and keys hidden in unique places. It has also been ported to DSiWare.

The game also has a semi-sequel in the form of Donkey Kong II.

Super Smash Bros. series
Mr. Game & Watch has a move where he swings a key in a near-identical fashion to Donkey Kong Jr..