Freedom Fighters

Type in the following during the middle of gameplay:

• ioigod - god mode
• ioiflymo - ragdolls
• ioicharisma - max charisma
• ioiammo - infinite ammo
• ioiblind - invisibility
• ioifastmo - fast motion
• ioislowmo - slow motion
• ioishotgun - shotgun
• ioirocket - rocket launcher
• ioisniper - sniper rifle

During gameplay, type "ioihgun" to get the heavy machine gun.

To unlock the extra stage, Liberty Island, just beat the game on any difficulty.