Mike Tyson Heavyweight Boxing (Xbox)
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All boxers
Win the Bronze, Silver, and Gold belts.
Big heads
Press X, B, Up, Down when "Press Start" appears at the title screen.
Fight as Iron Mike
Win the Mike Tyson Challenge to unlock Iron Mike, the early version of Mike Tyson.
Fight as Mike Tyson
Win the Gold Belt to unlock Mike Tyson in single player mode.
Flat mode
Press Down, Up, B, X when "Press Start" appears at the title screen.
Mike Tyson Challenge
Defeat Mike Tyson and win the Gold belt to unlock the undisputed champ mode..
Platinum mode
Press X, B, L, R when "Press Start" appears at the title screen.
Small heads
Press X, B, Down, Up when "Press Start" appears at the title screen.