Unlockable: Completed Game
Beat the game and start a new game with the cleared data. This time through you will have the Demonic Compendium, no level limit on fusions and summons, and different costumes. You can also change to first person view by pressing SELECT.
Cheat: Debug Mode (Japanese Version)
During game play go to a terminal and replace the game disc with a different PlayStation 2 game. This will bring up a debug screen and you can put the game disc back into the system.
