GameWorld

Unlimited Health and Ammo :
While playing, pause the game and enter Triangle, Triangle, X, X, L2, R2, R1, R2, O, Square for unlimited health and ammo.

Unlockables

All Primary Weapons :
Complete the game on either "Recruit" or "Contractor" difficulties.

All Remaining Weapons (Secondary & Special) :
Complete the game on "Professional" difficulty.

Professional Difficulty :
Complete the game on either "Recruit" or "Contractor" difficulties.