Original URL: http://www.psxextreme.com/ps2-cheat-print/97.html
State of Emergency

NOTE: These cheats will not work if you are holding a weapon.

Invulnerable (Thetorix)

L1, L2, R1, R2, X

Infinite Ammo 

L1, L2, R1, R2, Triangle, Square 

Looting on the rise 

L2, R2, L2, Triangle, R1, L1, R2, L2, Triangle

Tiny Player 

R1, R2, L1, L2, X

Big Player 

R1, R2, L1, L2, Triangle

Normal Player 

R1, R2, L1, L2, Circle

Punches Decapitate 

L1, L2, R1, R2, Square

Infinite Time 

L1, L2, R1, R2, Circle

All Weapons

Pause the game: hold L2 and press Square (3), L1, R1, R2, Square (5)

Eat People

Square (2), Triangle, Square, X, Up

Infinite Ammo

L1, L2, R1, R2, Triangle

Unlock Characters in Kaos mode:

Spanky: complete the mall level in revolution

Freak: complete China Town in revolution

Bull: complete the East Side level in revolution 

Unlock new stages in Kaos mode: 

China Town: Get the #1 high score in Capitol City Mall (Chaos mode)

East Side: Get the #1 high score in China Town (Chaos mode)