Box as Ashy Knucks
In Career Mode, enter the name 'MECCA'.

Box as Muhammad Ali
Enter SBATISTE at name entry when you fight in career mode.

Box as Barry Sanders
Enter MRBARRY in career mode name sign up

Unlock more characters
Enter any of the following as names to unlock the character:

Name - Player

OSUNA - Bernando Osuna
HATCHER - Charles Hatcher
ZITO - Chuck Zito
BOSTICE - David Bostice
DEFIAGBN - David Defiagbon
JRSEAU - Junior Seau
OWNOLAN - Owen Nolan
AUSTIN - Ray Austin
STEVEF - Steve Francis
NELSON - Trevor Nelson DEMART - David DeMartini
JGIAMBI - Jason Giambi
BAILEY - Joe Mesi
JBOTTI - John Botti

Signature moves
Press Triangle + Circle todo a boxer's signature move. Example: press Triangle + Circle with Tua and he will do his devastating Left hook.

Illegal head butt
While a match is playing, hold R1 + R2 and press Triangle.

Illegal low punch
While a match is playing, hold R1 + R2 and press X.

Illegal kidney punch
While a match is playing, hold R1 + R2 and press Circle.

Illegal elbow
While a match is playing, hold R1 + R2 and press Square.

Illegal kick
While a match is playing, press Triangle + Circle + X + Square.

Bite Your Oppenents Ear
While fighting hold down L1 + R1, so that the boxer would hold the opponent and then press Triangle + Circle + X + Square.