The Chain Scene, also called the chains or Round 4, is the fourth and last level of the game Donkey Kong Jr., and the second part of Mario's hideout. This level also appears in a microgame in WarioWare: Twisted! and WarioWare Gold, though in the latter, it appears in level 3.
Mario is on top of a tall building with Donkey Kong and Donkey Kong Jr. has to, similar to the 100 m stage with the bolts, move all of the keys into their keyholes while avoiding the Birds and Snapjaws. This time, there are more Birds, but they do not bombard Donkey Kong Jr. with eggs like in the Jump Board Scene. After moving all six keys into their keyholes, the platform (and cage) disappear and Mario and Donkey Kong both fall down. Donkey Kong is saved by Donkey Kong Jr. and, in the arcade version, Mario gets up and chases after them but gets kicked away. The game then ends and restarts to the Vine Scene.
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