Rei Zero Cheats (PlayStation 2)

Successfully complete the game on the nightmare difficulty setting. Note: You must
play from beginning to end.

Successfully complete the game on the nightmare difficulty setting. A "Chapter" option
will be unlocked in story mode.

Successfully complete the game in battle mode to unlock the nightmare difficulty setting.

Allow the game to be paused for a few minutes. The "ghosts" will begin to put their
bloody hands on the screen.

 Game Shark Codes 

Successfully complete the game to unlock the "Battle Mode", "Ghost List", "Sound Test",
and "Special Function" options as well as alternate costumes.