Terminator 3: The Redemption Cheats

The cheat options are unlocked for every 10,000 points scored in the game. Successfully complete the game to unlock all of the following cheat options:

During the Credits Movie in the Main menu section enter the following

All Upgrades:
X + Y + L
Unlock All levels:
X + Z + Y
Invincible Mode:
X + Z + R

Select the Credits option from the main menu, then press the button combinations listed below.

X+Y+L = Enable All Upgrades
X+Z+R = Turn On Invincibility Mode
X+Z+Y = Unlock All Levels

Input these during the Credits Movie in the Main Menu section

Invincible Mode: X + Z + R
All Upgrades: X + Y + L
Unlock All levels: X + Z + Y

Input these during the Credits Movie in the Main Menu section
Invincible Mode: X + Z + R
All Upgrades: X + Y + L
Unlock All levels: X + Z + Y

Go to the main menu and pick the
"Credits Movie" option and press R + Z + X during the movie. 
This cheat will now be unlocked