Bring up the console and type:

Type = Action 

~ behindView 1 = Allows you to play in third person (0 is first person) 
~ ghost = Allows you to fly around the map (typing Walk will end it) 
~ fullAmmo = Stocks your player with lots of ammo 
~ demoRec demoname = Records a demo of your current game 
~ stopDemo = Stops recording current demo 
~ demoPlay demoname = Plays the demo you call upon. 
~ god = Makes you invincible 
~ godteam = Makes you and your team invincible 
~ godterro = Invincible for Terrorists
~ godhostage = Makes the hostages invincible; this command: 1 = Yes 2 = No 
~ godall = Activates all the god modes 
~ toggleUnlimitedPractice = Mission objectives are updated but game never ends 
~ toggleCollision = Allows you to walk through other actors 
(team, terrorists and hostages) 
~ toggleThreatInfo = Shows threat info 
~ neutralizeTerro = Neutralises all terrorists on the level 
~ disarmbombs = Disarms all the bombs on the level 
~ deactivateIODevice = Deactivate IODevice like phones, laptop (ie: plant a bug) 
~ rescuteHostage = "Rescues" all hostages on the level 
~ disableMorality = Disables morality rules -- Terrorist Commands -- 
~ walk = Resume Normal Gameplay
~ callTerro = Calls all terrorists to your location 
~ playerInvisible = Toggle player detection by terrorists 
~ tSurrender = All terrorists surrender on sight 
~ tSprayFire = Makes the terrorists shoot wildly when they see you 
~ tAimedfire = Makes all terrorists aim and fire at you 
~ tRunAway = Makes all terrorists run away from you 
~ tNoThreat = Sets all terrorits back to their original no threat state 
~ rendSpot = Allows you to see where all terrorists have spawned on the
map -- Hostage Commands --t 
~ toggleHostageThreat = Toggles hostages threat info 
~ setHPos = Sets the hostage position 
(0=Stand, 1=Kneel, 2=Prone, 3=Foetus, 4=Crouch, 5=Random) 
~ resetThreat = Resets Hostages Threat 
~ HNA = Plays next hostage animation 
~ HPA = Plays previous hostage animation 
~ HP = Plays animation of hostage (0=no loop, 1=Loop) 
~ showFOV = Shows the field of view of all actors 
(Teammates, Hostages, Terrorists) 
~ gunDirection = Displays weapon direction of all actors with a "laser beam" 
~ route = Shows where terrorists and hostages have moved through out the map 
~ routeAll = Shows all routes that Terrorists and Hostages take (Will cause lag) 
~ killThemAll = Kills and removes all non-playor actors 
~ killTerro = Kills and removes all terrorists 
~ killhostage = Kills and removes all hostages 
~ killRainbow = Kills all Rainbow operatives 
- killpawns = Kill/Remove Opponents
- sgi = Game Modes
- rainbowskill = Rainbow 6 Multiplayer Version Mode
- pago = All Enemys Will Attack (Developers Music)
- resetmeall = Resets All Cheats, Gameplay
- quit = Quit Game
- hp = ?
- getmode = ?
- rotateme = ?
- listzone = ?

Level select:
Enable the unlock all code at the mission selection screen. Click on another mode 
(for example, "Practice", "Terrorist Hunt", etc.) for the unlocked levels to begin 
appearing.

Clearing rooms:
To clear out a room, stand besides the door, as one of your teammates would 
have if you told him to clear out a room. Make sure that your clip is full and the 
action icon does not have the brackets around it, so your teammates will not open 
it for you and take fire. Finally, make sure that all of your teammates are stacked 
up properly: 

(for double doors)   _____       (for single doors) ___
               *     *  *                          *  *
                     *                             *  *

Then, rush the room with thermal/night vision (your choice) on and scan left to 
right for enemies. Then, strafe to the left of the door to let your teammates in. 
Next, walk around the perimeter of the room and when your teammates say threat 
neutralized (on some smaller rooms they do not say anything), your work is done. 

Garage: Capturing Emilio Vargas: 
In order to capture Vargas you need to move fast. This will cause you to take 
some damage, but to take out enemies quickly use the HE grenade launcher or the 
Red Phosphorus grenade launcher. Use it on groups of enemies as you are chasing 
after him. This works best on the two guards in the cafeteria style room; if you 
have not caught him yet, you can shoot the grenade off the wall and take both out 
without stopping.

Oil refinery:
On the first level that you are in an oil refinery, take an HE grenade launcher as 
your secondary weapon. At the end when the enemies fire RPGs, take it out. Step 
out from under the roof area so that enemy fires an RPG. Three enemies will 
appear. Shoot an HE round to kill them. Move back under the roof, reload you HE 
Grenade launcher, and wait until a second RPG is fired. Move around the corner 
and with your HE grenade launcher and shoot the man that is standing there. Turn 
around, and when the garage door opens, shoot the barrels on the right side with 
your primary weapon. Kill all enemies, secure the hostage, and the level will be 
completed. Note: It recommended that you save the game when you open the 
door that leads to the RPG area.

Penthouse: Easier kills:
Even though you are told "no shooting" in this level, there is a surprise later where 
you have to shoot to first save someone then escape. Because of this, change 
your secondary weapon to either the Desert Eagle or SR-2. This way you will not 
have to shoot someone four times to kill him with a weak silenced pistol.

Conserving ammunition:
After every fire fight, reload even if you have 22 rounds remaining. If you keep 
doing this, you should have enough ammunition for the long fire fights and levels.