Press the [~] in the game and type in the cheats, confirm with [Enter] (maybe remove
 the 'say' first):

 GOD                  - Invincible
 GODALL               - Invincible for All
 GODTEAM              - Invincible to all Team
 GODTERRO             - Invincible for Terrorists
 GODHOSTAGE           - Invincible for Hostages
 GHOST                - Enable No-Clipping Mode
 WALK                 - Resume Normal Gameplay
 FULLAMMO             - Give Full Ammo
 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                   - ?
 GETNETMODE           - ?
 ROTATEME             - ?
 LISTZONE             - ?