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Reef Chief is the fourth level of the Reef in the Donkey Kong Adventure mode of Mario + Rabbids Kingdom Battle.
Prior to the start of the level, Finn is seen gorging on Bad Bananas when he spots Donkey and co., upon which he immediately attacks them.
This level consists of a boss battle with Finn. It is a circular arena with several Hoppers.
Afterwards, Finn is freed from the Megabug's influence, and Donkey Kong and co. acquires the second key necessary to access Rabbid Kong's hideout.