From the Super Mario Wiki
The Chimpy Charge (Hurtus Cranium) is one of Diddy Kong's special moves in Donkey Kong 64. Diddy learns this ability after buying the potion from Cranky Kong at his lab in Jungle Japes for three Banana Bunch Coins.
The Chimpy Charge can be activated by pressing and holding the button while hitting the button. The attack can be used to activate wall switches or destroy walls.
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