Start the training level, then enable the "Level skip" code. You will complete it with a "Silent Assassin" rank. Choose the training level again, and all the weapons in the game will be unlocked in the weapons storage area. This also will unlock the Cardboard Tube weapon.
Come back to Life
When your health bar reaches zero the game will enter a black and white death sequence. If you are able to get four consecutive head shots on four different enemies during this sequence you will receive a small amount of health and return to the game.
Dual Gold Desert Eagles
After getting the key card from the Wang Fou Incident you most likely went to Asylum Aftermath to collect your Mini Gun. After that continue thru the level and when you get to a large room with windows and the door ahead... STOP! One patient will be walking around and on your right will be steps leading down to a door with red lights over it. Enter that room with the key card. Walk forward until you find the Gold Desert Eagle Guns right under your nose.
Getting the M60 Early
On the level "Deadly Cargo," it is possible to get the M60. If you don't get it here, you will have to wait until the 2nd to last level. Make your way to where the SWAT sniper is, on the building overlooking the ship. After the SWAT team attacks the ship, a helicopter will begin circling the area. If you shoot the gunner on the ship, he will fall to the ground with his M60. Make sure that you assassinate the target first and you kill the gunner while the helicopter is over a land area that you can reach.
Ghost
In the level Traditions of the Trade, as soon as you enter the building if you go to the right of the staircase you will see a set of double doors. Go through them and pick the second set of double doors with a sign that says hotel wing closed. Once you do that go to room 106 or any of the other rooms around there closed off by police. Go into that room and walk into the bathroom then go into first person view and look in the mirror and you will see a ghost.
Level select
Press X, Y, B, Left, Up, Right, L, R at the main menu.
Live Again
When your health bar reaches zero the game will enter a black and white death sequence. If you are get four consecutive head shots on four different enemies during this sequence you will receive a small amount of health and return to the game.
Master Key
In the level "Traditions of the Trade" when you are on the 3rd floor you will eventually see a vacuum boy. When he opens a door to vacuum the room, go to the door and pick up the master key. You should then have access to most doors.
Reflection Ghost
When playing The Meat King's Party look at the loading screen of the slaughter house. You should see a faint skull. This skull is also on the pinball machines in Rotterdam Rendezvous.
See Lee Hong
In the level Asylum Aftermath, once you get the double Desert Eagles, keep going forward through the second set of doors until you get to the last tank with a body in it, then look to the right and there is a tank with Lee Hong written on it.
Skip Level and Earn Secret Weapon
During gameplay enter R, L, UP, DOWN, A, Click Left Thumbstick, B, A, B, A.
Unlock All Levels
Enter the following code at the main menu: X, Y, B, Left, Up, Right, L, R.
Unlock the Mini Gun
The mini gun is held by a patient who is behind the locked doors of a basement room in Mission 1: Asylum Aftermath. The keycard that unlocks the doors can be found during Mission 9: The Wang Fou Incident. It is called Orthmeyer's Keycard and is on Lee Hong's desk in his office on the second floor of his mansion. After finding the card, finish the mission and save your progress. Quit to the main menu and replay the first mission. Head to the northern section of the map and turn right in the small room with the red flashing sensor on the ceiling. Pass through the west door and dispose of the patient in order to collect the mini gun.
Unlock the Tube
Beat the Training with SA rating.
Unlock Weapons
Unlock each weapon by completing the corresponding mission and achieving the Silent Assassin rating.
