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Nintendo 64 - Bio Freaks cheats

Taunt opponent
Hit C-Left + C-Right, while playing a match.

Screen-saver
Pause the game play and ream idle for a few seconds.

Changed view:
During a match, hold Left and hit Start. 

Default view:
During a match, hold Down and hit Start

Bigger hit:
Pause the game play during a match, and turn OFF the shields. 
Resume the game and hold A while attacking.