Unlock Cheat Menu: At the Main menu press Up, Down, Left, Right, Down, Down, Right, Right, Square.
Debug Mode: When the Core Design copyright message appears quickly press Up, Down, Left, Right, Down, Down, Right, Right, Triangle.
Invincibility: Begin a game and then quit by pressing Start + Select then at the Main title screen press Up, Up, Up, Down, Down, Down, Right, Right, Triangle. If the code has been entrered correctly you will hear a chime as confirmation.
Unlock 'Payback' Mission: When you have entered the briefing area find the locker on the left side of the screen and open it. At the password screen enter 4L2CZCQKDAABACQDB and a mission to destroy the Crimson Blade training camp in the Masirah Mountains will start.