Hitman: Contracts Online Strategy Guide
Agent 47 is having a bad day. He has a hole in his gut, he's stuck inside a dingy hotel room that smells like pee, and the last guy who looked at him wrong managed to make a crack about his shiny bald head before the fiber wire turned the man's windpipe into a bent straw.
But before you can find out what's gonna happen next, you'll have to help Agent 47 through a bunch of missions from his past. Don't know how to tackle those tough objectives? Don't know how to deal with those annoying guards? Wondering how to achieve the Silent Assassin rating so you can unlock some extra weapons? This guide will provide all the answers you need.
Hitman: Contracts Online Strategy Guide

Cheat List
Open the hitmancontracts.ini file (it's in the folder where the Hitman game files are) and add the following lines to it:

ENABLECONSOLE 1
ENABLECHEATS 1

Then start the game and during gameplay press SHIFT + ESC. Change the cheat value from 0 (false) to 1 (true) to enable the cheat.
God 1 :Enables God Mode(God 0 deactivates it)
Giveall :Gives all weapons and items
Infammo :Gives Infinite Ammo for all guns
Nailgun 1 :Enables Nail gun (Nail gun 0 disables)
Invisible 1 :Makes you invisible to enemies*
Invisible 0 :Deactivates invisibility

Cheat: Cardboard Tube
Enter "IOIPENNY" after enabling cheats.
Cheat: Level Select
Open the HitmanContracts Configuation Settings file found in:

C:\Program Files\Eidos\Hitman Contracts

and change the following:
DefaultScene=AllLevels\Logos.gms
to
DefaultScene=AllLevels\levelmenu.gms
Save and play! You will get a level select menu.

Unlockable: 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.

Unlockable: Weapons
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