24: The Game Cheats

Cheat mode:
Hold L1 + L2 + R1 + R2 while "Options" is highlighted at the main menu to display the "Security Clearance" screen, with a password entry prompt for the "Invulnerable", "Infinite ammo", "All missions", and "All bonuses" options. Hold X and press D-pad Left or Right to change one of the characters in the desired password. Release X to input that character. Press Right to highlight the next character and repeat until the password is filled. Press Square to accept the password. The text will turn orange to confirm correct code entry. Press Triangle to exit the password entry screen.

Invulnerable:
Enter 66BAUER as a code in the North American version of the game. Enter BAUER066 as a code in the European version of the game. Then, select the "Load" option and choose a previously saved file to continue the game.

Infinite ammo:
Enter 62ALMEIDA as a code in the North American version of the game. Enter ALMEIDA062 as a code in the European version of the game. Then, select the "Load" option and choose a previously saved file to continue the game.

All missions:
Enter 72DESSLER as a code in the North American version of the game. Enter DESSLER072 as a code in the European version of the game. Then, select the "Previously on 24" option, then the "Missions" option. Select a file, highlight "Missions", then press Circle to select any mission.

All bonuses:
Enter 54PALMER as a code in the North American version of the game. Enter PALMER054 as a code in the European version of the game. Then, select the "Previously on 24" option, then the "Missions" option. Select a file, highlight "Missions", then press Square to select the bonuses.