Unlock Arenas - At the 'My Corner' menu enter the following code to unlock all the arenas: Left, Left, Left, Right, Right, Right, Left, Right, Right.
Unlock Ring Girls, Entrance Music, Bonus Trucks, Special Punches etc. - Win fights in Career mode.
Special punches - Defeat the following Boxer to unlock the special punch/item: Evander Holyfield - Lunging Hook Punch Bernard Hopkins - Lunging Hook Punch Joe Frazier - Lunging Hook Punch Jake LaMotta - Shine the Glove Punch Sugar Shane Mosley - Lunging Uppercut Punch Chris Byrd - Lunging Hook Punch Felix Trinidad - Wave In Punch Bernard Hopkins - Watch the Birdie Punch Roy Jones - Look Ma No Hands Punch Muhammad Ali - Ducking Hook Punch Antonio Tarver - Homerun Punch Sugar Ray Leonard - Get Bolo Punch Sonny Liston - Sledgehammer Punch Felix Trinidad - Tito Truncks Bernard Hopkins - Executioner Trunks
Unlock Big Tigger - At the 'My Corner' menu select 'My Corner' menu and look at the 'Most Wins - Boxer' at the 'Record Books'screen then press Up twice to unlock Big Tigger the Middleweight fighter, a sound will confirm correct code entry.
Unlock Midget Mode - At the Main menu select 'Play Now' and enter the following combination to unlock Midget mode: Left, Left, Left, Right, Right, Right, Left, Right, Right.
Unlock 'Big Head' Mode - At the Main menu select 'My Corner' option and enter the following combination to unlock 'Big Head' mode: Left, Right, Left, Right, Left, Right, Left.
Taunt - Press L + R + click Left Analog-stick + click Right Analog stick to taunt you opponent during a fight.
Recover from Knockdown - Use the Left Analog-stick and Right Analog-stick to merge the images in your view until they become one to recover from a knockdown.
Uppercut Without Total Control - Press Jab + Hook to throw an uppercut without Total Control Punching.