First person play mode:
Successfully complete the game once under any difficulty setting except for "very easy". A selection for first person play mode will be unlocked on the "Special" option at the main menu. Quickly press Triangle(2) during game play after selecting that option.

Alternate costumes:
Successfully complete the game twice under any difficulty setting with the same saved game file. Snake will have a tuxedo, Meryl will have Snake's original outfit, and Ninja will have a red and blue cyborg costume during the third time the game is played.

Alternate title screen:
Press the D-pad at the title screen to change the background colors.

Contact staff:
Enter 140.7 at the codec screen.