Terminator 3: The Redemption Codes -

Cheat mode:
Select the "Credits" option at the main menu, then press , , while watching it. This will enable level selection and the remaining cheat codes. Begin a game, then save your profile. Then, use one of the following cheat codes on that profile.

All upgrades:
Select the "Credits" option at the main menu, then press , , while watching it. The "All upgrades" cheat option will now be unlocked.

Invincibility:
Select the "Credits" option at the main menu, then press , , while watching it. The "Invincibility" cheat option will now be unlocked.