Invincibility
Start a game, then Press [Start] + [Select] to quit. Press [Up]x3, [Down]x3, [Right]x2, [Triangle] at the main title screen. The sound of a chime will confirm correct code entry. During game play, the energy bar will still go down, but will eventually rise again.

Debug mode
Press [Up], [Down], [Left], [Right], [Down]x2, [Right]x2, [Square] when the Core Design copyright screen appears in the NTSC version of the game. For the PAL version of the game, press [Triangle] instead of [Square]. A debug menu will appear with the following options:

Play any level.
Run a CD test.
Play the game with maximum firepower.
View the FMV sequences.
View the credits.
Start a sound test.

For an additional bonus, highlight the credits option in the debug menu and press [Left]x8, [Triangle].

"Payback" mission
Enter the briefing area and locate the locker on the left side of the screen Open the locker and enter " 4L2CZCQKDAABACQDB " at the password screen. A mission to destroy the Crimson Blade training camp in the Masirah Mountains will begin.