Ingame cheat menu (version 1.0 of the game only)
Edit hitmanbloodmoney.iniadd "EnableCheats" (without the quotes) at the endIngame press "C" to access the ingame cheat menu.
Instant Level Complete
After enabling the in-game cheat menu, press Shift-C at any time during the level to complete the mission with your current stats; using this code at the beginning of a level will net you a Silent Assassin rating.

Cheat
Effect
1)Beam here
This will teleport agent 47 to where ever the player crosshair is currently pointing, unless the point is blocked by terrain.
2)Teleport
This will teleport agent 47 to certain points in the level.
3)Show OSD
1 to display HUD, 0 to hide it.
4)Time Multiplier
This will speed up the passage of time, the highest level is 10. 10 can cause some side effects.
5)Show enemy vision
Saddly this code also doesn't work.
6)Invisible Mode
1, or 0. You can't be seen by actors in the level.
7)God Mode
1, or 0. You will take no damage.
8)Complete level
This will finish all objectives in the level for you, giving you a rating of Silent Assassin.
9)InfClip
Same as InfAmmo, only this doesn't require you to reload.
10)InfAmmo
Once the value is set to one you have a infinite supply of ammo.
11)GiveAll
Saddly this code just crashes the game.
12)Give Some
Does nothing
13)Test Cloth
This will change agent 47's clothing to one of the possible disguises in the level.