Invisible Jack
At the new game screen, hold L1, L2, R1, R2, then press Triangle, Triangle, Up, Up, Triangle. Note: Enemies can still see Jack, but all you see is the ball shadow.
Infinite Adrenaline
At the new game screen, hold L1, L2, R1 and R2, then press Left, Right, Left, Circle, Square.
Spine break
When you are locked up "Iron Point" and are walking around in the hall only two or three people will be around. One of them will run up to you and say something. When you run away, they start to walk away. As they walk away you can go in back of them and do the grab. However, they move too much and you will end up breaking their back.
Make Enemies Weaker
Go to the Press Start screen then to the New Game screen and hold L1 + L2 + R1 + R2 and press Square, Left, Triangle, Up, Down.
Unlock Harder Boiled mode
At the main menu, hold L1 + L2 + R1 + R2 and press Triangle, Square, Left, Left, Circle.
Chapter 13: Voice access
Kill one of the men that has green on. You will see a man in yellow walk out in the open and run back. After a moment, the man in the yellow will run over to you. When he does this, and grab him. If another man runs with him, kill him and leave the man in yellow alive. Take him to give the voice authorization and you will be able to open gate. When you go over to the gate, a lot of men will be there. An easy way to kill all of them is to run up to them and grab one as a shield. The man you grab will get killed quickly. Keep doing this until only one person remains.
Get 2 Guns
Go to the Press Start screen then to the New Game screen and hold L1 + L2 + R1 + R2 and press Triangle, Circle, Up, Up, Up.
Chapter 1: All pistol disarms
When you start the level, a man will appear and try to shoot you. Lock on to him and use your dog (Shadow) to kill him. Shadow will bring his gun to you. When you kill him, another man by a crane will start to shoot. Lock on to him and shoot him with the gun you received. When you kill him, some pipes will fall down, making it appear as if you cannot get through. However, you can. Immediately when you enter, a man will come up behind you and say "Drop it!". You will throw down your weapon and turn around. When you turn around, you will not be able to move anymore --this will make it easier. You will be prompted to press Circle to disarm him. You can either do that, or do it with the Analog-stick. To get all of them, keep doing the level over or try it the old fashioned way.
Chow Yun Jack Mode
At the screen that says "New Game", hold L1, L2, R1, R2. Then press TRIANGLE, CIRCLE, UP, UP, UP. Jack will have dual guns a-blazin'.
Unlimited Ammo
Go to the Press Start screen then to the New Game screen and hold L1 + L2 + R1 + R2 and press Up, Left, Down, Right, Circle.
Back to Ps2