Unlock All Levels
To unlock all levels, input “F3ARDAY1″ as your profile name. Note: Achievements will be disabled.
Saving Medkits
Make a mark of some sort to lead you back on some Medkits that you could not carry before. If you so happen to run out of your own because of a big fight you can find them again. This is useful in Interval 11 with the armies of ghosts coming after you. Just make sure that you are able to backtrack to get the Medkits you left behind.
Infinite Dual-Handgun Ammo
To get infinite ammo for the dual-handguns, equip the dual-handguns with at least one bullet when you have all weapons slots full. Locate a weapon that is not in your inventory on the ground(not on top of anything). Hold Square to trade the dual-handguns for the weapon, then switch back one handgun and grab the other. The number of bullets you previously had for the dual-handguns will double.
Incorrect Spelling
“Strong Language” is spelled incorrectly when the ESRB rating is displayed at the outset of the game.
Fight Against Assassin Super Soldiers
Because the assassins are difficult to see due to their camouflage and high speed running, try using slow-motion with L2. You will notice them immediately once they are slowed. After that, let all of your rounds into them. If you do not have slow-motion (for example, in the bonus mission when playing as the demolition man), you must have a quick finger and a good eye to notice them running around. There are two ways to do this. The first is to toss a grenade to reveal the assassin for a certain amount of time. Hopefully the splash radius will either hit him or kill him. Note: The grenade has a two to four second delay before exploding, and correct timing is required. The second way is to wait until the assassin approaches directly in front of you. When he reveals himself, start firing at him.