Unlimited ammunition:
Enter L1, L2, X, R2, R1 as a code. 

Unlimited first aid kits:
When making the optical disc in Episode 2, if you type in the Chris Barnes code 
first, you will get a first aid kit. You can type it in as many times as desired.

Defuse Bomb:
In the beginning of act two for red falls you will go to a building where you'll take a 
train. Before you can leave you'll have to activate the power. Kill the zombie. All 
you'll have to do is flip the switch in the back, then flip the switch on the control 
panal, then just flip the switch in the back one more time to give power to the 
train. But before you get into the train check the body of the zombie in the control 
room. You will find fingerprint liquid. Use this liquid on the bomb and it will show 
you the three digit number. This number will defuse the bomb.

Unlock all acts: 
Enter R2, Right, L2, Up, Square as a code.

One shot kills:
Enter Circle, L2, Down, R1, X as a code.

Grenade bullets:
Before loading a game, enter the options menu, select "Game Settings", 
then "Cheats". Enter X, Circle, Square, L2, R2 as a code. 

Invincible player:
Before loading a game, enter the options menu, select "Game Settings", 
then "Cheats". Enter Up, Square, Circle, X, Down as a code. 

All bonus features unlocked:
Before loading a game, enter the options menu, select "Game Settings", 
then "Cheats". Enter Left, R1, L1, Down, Circle as a code.