TechLookz

Go to the character selection screen and enter any of the codes bellow.
If the codes are accepted, you should hear a sound.

Cheat mode:
Press Left, Right, Left(2), Right, Up, Down, R1(5), R2

All boxers:
Press Left(2), Right, R2, Left, Right(2), R1(2), R2.

All champion costumes:
Press Left, Down, Right(2), Up, R1, R2, R1(20), R2.

All holiday costumes:
Press Left(2), Down, Right, Up, R1(8), R2, R1(4), R2.

All training:
Press Left, Down, Up, Down, Up,R1(20), R2.

Set holiday to New Years:
Press Right, Up, Down(3), R1, R2.

Set holiday to Valentines Day:
Press Right, Up, Down(3), R1(2), R2.

Set holiday to St. Patricks Day:
Press Right, Up, Down(3), R1(3),R2.

Set holiday to Easter:
Press Right, Up, Down(3), R1(4), R2.

Set holiday to Independence Day:
Press Right, Up, Down(3), R1(5),R2.

Set holiday to Halloween:
Press Right, Up, Down(3), R1(6),R2.

Set holiday to Thanksgiving:
Press Right, Up, Down(3), R1(7),R2.

Set holiday to Christmas:
Press Right, Up, Down(3), R1(8),R2.

Set holiday to New Years:
Press Right, Up, Down(3), R1, R2.

Fat boxer:
Press Right(2), Up, Down, Right, R1(2), R2.

Thin boxer:
Press Right(2), Up, Down, Right, R1, R2.

Undead boxer:
Press Left, Up, Right, Down, R1(2), R2.

Big head:
Press Right(2), Up, Down, Right, R1(3).

Big gloves:
Press Left, Right, Up, Down, R1, R2.

Faster gameplay:
Press Right(2), Up, Down, Right, R1(4), R2.

Hyper speed mode:
Press Left(2), Down, Up, Down, Right(2), R1(19), R2.

Additional 15 camera angles:
Press R1(20), R2, R1, R2, R1(21), R2, R1(18), R2, R1(9), R2, R1(14),
R2, R1(5), R2, Left, Right, Up,Down, R2.

Start at final match:
Press R2, Down, Right, Up, Left, R1(6), R2, R1(2), R2.

View ending:
At the main menu, press Right(3), Down, R1, R2.

Full level 1 Rumble meter:
Pause the game and press R1, R2, Down, Up(2), Left, R1(3), R2.

Full level 2 Rumble meter:
Pause the game and press R1(2), R2, Down, Up(2), Left, R1(4), R2.

Full level 3 Rumble meter:
Pause the game and press R2, R1(2), R2, R1, R2, R1(4), R2, Left,
Right, Up, Down.

Box as Freak E. Deke and Michael Jackson:
Press R1(13), R2, R1(10), R2

Unlockable characters:
Bill Clinton: Finish the game in arcade mode 9 times
Freak E. Deke: Finish the game in arcade mode once
Freedom Brock: Finish the game in arcade mode 6 times
G.C. Thunder: Finish the game in arcade mode 3 times
Hillary Clinton: Finish the game in arcade mode 10 times
Michael Jackson: Finish the game in arcade mode 2 times
Robox Rese-4: Finish the game in arcade mode 8 times
Rocket Samchay: Finish the game in arcade mode 7 times
Shaquille O'Neal: Finish the game in arcade mode 5 times
Wild "Stubby" Corley: Finish the game in arcade mode 4 times
Rumble Man: Finish the championship mode with all characters, after
finish arcade mode in hard mode.

Change costumes:
Go the character selection screen, highlight any boxers
and push Square.

Unlockable outfits:
Unlock the champion outfits. Finish the championship mode
Secret Easter outfit: Modify the system date to April 23, 2001
Secret Halloween outfit: Modify the system date to October 31
Secret Independence Day outfit: Modify the system date to July 4
Secret New Year's outfit: Modify the system date to January 1
Secret St. Patrick's Day outfit: Modify the system date to March 17
Secret Valentine's Day outfit: Modify the system date to February 14
Selene Strike and a snowman outfit for Rumble Man: Modify the system
date to December 25
Unlock the champion outfits. Finish the championship mode