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Monkey robots refer to various enemy Donkey Kong toys. They first appear in Mario vs. Donkey Kong 2: March of the Minis and have shown up in all subsequent games of the Mario vs. Donkey Kong series. Like Mini Donkey Kongs, they are based on the character Donkey Kong, who appears as the main antagonist in most of the games in the series.
Unlike other enemies, monkey robots do not harm the Minis directly when they come into contact with them. Once they catch the Minis, monkey robots perform a certain action on the toys which can help or hinder them, depending on the context. As an example, Circus Kongs juggle the Minis up and down, enabling them to reach higher platforms in some cases but keeping them in a perpetual motion if no platforms are present above. Although monkey robots cannot be destroyed, they can be stunned and neutralized temporarily by using a form of attack on them. Doing this also releases any Mini currently under their control.