Pick Level:

Go to the options screen and set Vibration to 1, sound effects to 0, music to

0. Now hold L2+L1+R2+R1+ circle + square.

Get Maniac Difficulty & Extra Helicopters:

Finish the game on hard difficulty setting for maniac difficulty and a new helocopter

is yours. Finish on maniac for another new one.

GameShark Codes

[M] Must Be On  
EC8782801449D2E4  

Inf Ammo Weapon 1  
4CD5B2481456E788  

Inf Ammo Weapon 2  
4CD5B24C1456E788  

Inf Ammo Weapon 3  
4CD5B2501456E788  

Inf Armor  
4CC1D49A1456248F  

Never Overheat  
4CC1D48C1456E7A5  

Thanks to Revolution readers brenden bomberger and Brian Seau!