Hitman 2: Silent Assassin Cheats

Level select
At the main menu, press R2, L2, Up, Down, Square, Triangle, Circle.

Enter these codes while playing, without pressing pause

Level Complete - R2, L2, Up, Down, X, L3, Circle, X, Circle, X
Mission Select - R2, L2, Up, Down, Square, Triangle, Circle
Gravity - R2, L2, Up, Down, X, L2, L2
Lethal Charge - R2, L2, Up, Down, X, R1, R1
Punch Mode - R2, L2, Up, Down, X, Up, Up
Full Health - R2, L2, Up, Down, X, Up, Down
Bomb Mode - R2, L2, Up, Down, X, Up, L1
SloMo Mode - R2, L2, Up, Down, X, Up, L2
Megaforce - R2, L2, Up, Down, X, R2, R2
Nailgun Mode - R2, L2, Up, Down, X, L1, L1

Sawed-off shotgun
Beat two missions with a Silent Assassin rank.

M-4
Beat the St. Petersburg missions with a Silent Assassin rank.

Kill UN Guards
In the Motorcade Interception Level, one of the mission objectives is to spare the UN guards. You can kill them from behind with the Wire without being penalized.

Quick Pick
On some missions where you have to get passed a door you need your lock pick but it takes hours so start to pick then go to your menu and when you go back its done.