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A Boss Key in Jungle Japes.
A Boss Key is an item in Donkey Kong 64. There are 8 boss keys in total, all gotten by defeating a level boss, with the exception of the eighth, which is found at the end of Hideout Helm. The bosses of each level are accessed by the Troff n' Scoff rooms, and the final one can only be acsessed if the player has gotten both the Nintendo Coin and Rareware Coin. The boss keys are used to help free K. Lumsy, resulting in opening new levels and completing the game.