Cheat Big Head Mode:

From the main menu, select "my corner," and enter LEFT, RIGHT, LEFT, RIGHT, LEFT, RIGHT, LEFT.

Cheat Big Tigger Character:

Select "My Corner" from the main menu and then look at the record books. View the "Most Wins - Boxer" screen and press UP twice. Tigger is a middleweight fighter.

Cheat Midget Mode:

From the main menu, enter LEFT, RIGHT, LEFT, RIGHT, LEFT

Cheat Open All Arenas:

From the "My Corner" menu, enter LEFT, LEFT, LEFT, RIGHT, RIGHT, RIGHT, LEFT, RIGHT, RIGHT

Unlockable Ring Girls, Trucks, and More:

To unlock extras such as ring girls, bonus trucks, special punches, new entrance music, and more, simply complete in the Career mode and win fights.

Hint Uppercut Without Total Control:

To perform an uppercut with Total Control Punching disabled, press Jab + Hook together.

Hint Wake Up From Knock Downs:

To stand up after getting knocked down--not knocked out--use the Left and Right Analog Sticks to match up the three blurry images of the ref. Find a focal point, such as the EA logo on the ref's shirt, and move the two images to match the one that stays still. 

Cheats submitted anonymously.