Complete current mission with Silent Assasin rating:
During gameplay press R2, L2, Up, Down, X, L3, Circle, X, Circle, X

Enter these codes in the Main Menu:
Square, Triangle, Circle, Left, Up, Right, L2, R2

When you die, there will be a black and white death sequence. If you were able to commit at least 4 consecutive head shots on 4 different guards, you will be able to resume what you were doing with a small amount of health.

In the training level, enter the complete level code to complete the level with an SA ranking. Then, re-enter the training level to find that your weapons storage has been completely filled with all the weapons in the game.

To obtain some of the hidden weapons in the game, you must complete the missions with a Silent Assassin Rating to receive that weapon.

CZ 2000 Dual Pistols - Receive Silent Assassin Rating in Mission 1

Micro Uzi Dual Submachine Guns - Receive Silent Assassin Rating in Mission 2

Silverballer Silenced Dual Pistols - Receive Silent Assassin Rating in Mission 3

Magnum 500 Dual Pistols - Receive Silent Assassin Rating in Mission 4

Sawed-Off Shotgun Dual - Receive Silent Assassin Rating in Mission 5

M4 Carbine Silenced Assault Rifle - Receive Silent Assassin Rating in Mission 6

SG220 .S Dual Pistols - Receive Silent Assassin Rating in Mission 7

MP5 Silenced Submachine Gun - Receive Silent Assassin Rating in Mission 8

AK 74 Silenced Assault Rifle - Receive Silent Assassin Rating in Mission 9

GK 17 Dual Pistols - Receive Silent Assassin Rating in Mission 10

Micro Uzi Silenced Dual Submachine Guns - Receive Silent Assassin Rating in Mission 11

PGM Silenced Sniper Rifle - Receive Silent Assassin Rating in Mission 12