Tom Clancy's Rainbow Six 3 cheats and cheat codes for XBox

Invincibile mode: 
During the game play, push UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A
buttons on your Xbox controller to become invincible. Re-enter this cheat 
code to deactivate the cheat effect. 

Weapons with laser trail:
During the game play, push UP, DOWN, UP, DOWN, R-CLICK, R-CLICK on your 
Xbox controller to enable laser trail. When you shoot you will see red laser 
trails, and enemy weapons will shoot blue laser trails. 

Unlock All Maps
Go to the menu screen, then push Left, Left, Right, Right, A, B, L-Stick, 
L-Stick on your Xbox controller to reveal the entire map.

Wall of Fame Map
Go to the menu screen and push Left Stick, Left Stick, Right Stick, 
Right Stick, X, Y, B, A, B, A on your Xbox controller.


Old City And Import-Export On Team DM:
When playing online, it is possible to play Old City and Import/Export 
during Team Survival. Go to the main menu screen. Select Create Match. 
Go to GAME TYPE and select Mission. Then hit Next Highlight Old City 
or Import-Export and back out by hitting B.

Unlimited Ammunition:
If you have out of ammo for M60s, pistols, or assault rifles 
press Circle to reload.  Look at your clip counter. It might say 21, 
for example, and in bold numbers next to it 13. That means that you are 
expending your 13th round on your 21st clip. If you press O, you will 
reload to your maximum number, but still stay on your 21st clip.
Repeat as many times you want.