Rainbow Six

Pause the game. Now hold L1 and enter the following codes:

Level select:
Circle, X, Circle, Square, Square, Triangle, X, X. Note: This may also be done at the main menu.

Unlock all doors:
Triangle, Square, Square, Triangle, X, Circle, Square, Triangle

Full map:
X, Circle, Square, Triangle, Triangle, Square, Circle, X

See ending:
Square, Triangle, Square, Square, Circle, Circle, X, Triangle

Full health:
Triangle, Triangle, X, Circle, Circle, X, Square, Square

Restore Ammo:
Square, Square, Circle, Triangle, X, Triangle, X, Triangle.

Invincible hostages:
Circle, Circle, Square, Triangle, X, Triangle, X, Circle

GameShark Codes

Infinite Health       8005518a2400 
    
Infinite Ammo         80052bae2400 
                      800ae5b60063 
                      800ae8ea0063 
                      800aec1e0063 
    
All Missions Unlocked 8007e7e00001 
                      80080b68000d 
    
Infinite Time         800cbaf22400 
Infinite Health       8005518a2400 
Infinite Ammo         80052bae2400 
                      800ae5b60063 
                      800ae8ea0063 
                      800aec1e0063