Unlock Mike Tyson
On the main menu of Fight Night 2004 go to my
corner. Once your have done that you do this
with the analog sticks: Right, right, left,
left, up. You should here a sound if not, bad
Unlock Big Tigger For Middleweight Division
Go to the main menu and highlight MY CORNER then
RECORD BOOKS then MOST WINS-BOXER and then press
Up, Up. You should hear a sound.
From the main menu press Left, Right, Left, Right, Left.
Open All Arenas
From the My Corner menu enter Left(3x), Right(3x), Left, Right(2x).
Big Head Mode
Highlight the "Fight Now" option at the main menu, then press Left, Right, Left, Right, Left, Right, Left. If you entered the code correctly then you'll hear a sound. Select the "Fight Now" option again and you'll have a big head.