Unlock all venues:
Highlight the "My Corner" option in the main menu, after press
Left, Left, Left, Right, Right, Right, Left, Right, Right.
If the code is accepted, a sound will confirm the code entry.
Big head mode:
Highlight the "Fight Now" option at the main menu, then press
Left, Right, Left, Right, Left, Right, Left.
If the code is accepted, a sound will confirm the code entry.
Fight as Big Tigger:
Choose "My Corner", then "Record Books", after "Most Wins-Boxer".
Press Up, Up. If the code is accepted, a sound will confirm the
code entry.
Small fighter:
Highlight "Play Now" option at the main menu, then
Press Left, Left, Left, Right, Right, Right, Left, X.
or
Press Left, Right, Left, Right, Left at the main menu.
If the code is accepted, a sound will confirm the code entry.
Open All Arenas:
From the "My Corner" menu, enter
LEFT, LEFT, LEFT, RIGHT, RIGHT, RIGHT, LEFT, RIGHT, RIGHT
Midget Mode:
From the main menu, enter LEFT, RIGHT, LEFT, RIGHT, LEFT
Unlockable Special punch - Opponent to defeat:
Bolo Punch punch: Beat Ray Leonard in career mode.
Ducking Hook punch: Beat Muhammad Ali in career mode.
Look Ma No Hands punch: Beat Roy Jones Jr in career mode.
Lunging Hook punch: Beat Chris Byrd in career mode.
Lunging Hook punch: Beat Evander Holyfield in career mode.
Sledgehammer punch: Beat Sonny Liston in career mode.
The Birdie punch: Beat Bernard Hopkins in career mode.
Unlockable venues:
Ceasar's Palace venue: Win a match at Ceasar's Palace in career mode.
Staples Center venue: Win a match at the Staples Center in career mode.
Westerholz Arena venue: Win a match at Westerholz Arena in career mode.
Bangkok Palace venue: Win a match at Bangkok Palace in career mode.
The Viceroy venue: Win a match at The Viceroy in career mode.
Taunt:
Press L1 + R1 + L3 + R3 during a fight to taunt your opponent
