Platinum mode
Press [X], [B], [L], [R] when "Press
Start" appears at the title screen. All boxers will be unlocked.
Flat mode
Press [Down], [Up], [B], [X] when
"Press Start" appears at the title screen. Alternately,
press [Right], [Left], [B], [X],
Big heads
Press [X], [B], [Up], [Down] when
"Press Start" appears at the title screen.
Small heads
Press [X], [B], [Down], [Up] when
"Press Start" appears at the title screen.
All boxers
Win the Bronze, Silver, and Gold belts.
Mike Tyson Challenge
Defeat Mike Tyson and win the Gold belt to unlock the
undisputed champ mode..
Fight as Mike Tyson
Win the Gold Belt to unlock Mike Tyson in single player
mode.
Fight as Iron Mike
Win the Mike Tyson Challenge to unlock Iron Mike, the
early version of Mike Tyson.