Unlock Boxers
Enter the following name in the career mode to unlock the according boxer or do the code

People 

Ashy Knucks - KNUCKS 
Barry Sanders - SANDERS
Jason Gambi - GIAMBI
Junior Seau - SEAU
Owen Nolan - NOLAN
Steven Francis - FRANCIS

Silly

Baby - BABY
Bulldog - BULLDOG
clown - CLOWN
cyclops - EYE
gorilla - GORE


Codes

Full Attributies- 100% 

Sepia Tone Mode - SPEPIA

Black and White Mode - BAW

Invincibility - INVINCIBLE

Double Damage - DOUBLEDAMAGE

Bite Opponets Ear

During a match, hold L1 + R1 to clinch your opponent and press Triangle + Circle + X + Square

Illegal kick 

During a match, hold R1 + R2 and press Square. 




Tips/Hints

Using the cheap shots works well in the Arcade type modes

To perform a boxer's signature move press Triangle + Circle