Open all Levels
Enter the following code at the main menu: X, TRIANGLE, CIRCLE, LEFT, UP, RIGHT, L2, R2
Skip Level & get secret weapon
During gameplay enter R2, L2, UP, DOWN, X, L3, O, X, O, X
Get 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
Get 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 Orthmeyers Keycard and is on Lee Hongs 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.
Each weapon is unlocked by completing the mission and achieving the Silent Assassin rating.
Mission 1: CZ 2000 Dual Pistols
Mission 2: Micro Uzi Dual Submachine Guns
Mission 3: Silverballer Silenced Dual Pistols
Mission 4: Magnum 500 Dual Pistols
Mission 5: Sawed-Off Shotgun Dual
Mission 6: M4 Carbine Silenced Assault Rifle
Mission 7: SG220 .S Dual Pistols
Mission 8: MP5 Silenced Submachine Gun
Mission 9: AK 74 Silenced Assault Rifle
Mission 10: GK 17 Dual Pistols
Mission 11: Micro Uzi Silenced Dual Submachine Guns
Mission 12: PGM Silenced Sniper Rifle
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.
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.
To get the flame thrower on misson two when you kill the fat guy in bed snipe him in the head complete mission and go to mission 1.
To key card doors, go to the one down the stairs on basement floor and kill the docter sitting at top of stairs.
He will drop a key card unlock the door and at the end of the hall thair will be two swat at the door kill them WITH A SILENCED PISTOLso you don't alert the gaurds.
Take a swat uniform walk in the room kill the first gaurd he will have a master key go in the next door there will be a cabinet.
Open it with the master key and tada a flame thrower hint; IT HAS UNLIMITED AMMO