Unlock the Swimsuit mode option: Finish the game once, then go to the "Memory Code" event viewer to access to the Swimsuit mode option.
Extra costumes: Finish the game then save the cleared game. Load the cleared save file to access to the Chaos Flawless and Allen Swimsuit outfits.
Unlock Vector costume for Shion: Have a completed saved game file from Xenosaga Episode 2 on your memory card. Load Xenosaga Episode 2 saved game when starting a new Xenosaga Episode 3 game to unlock new costume.
The Business District Gate code: Go to the right as far as possible on Miltia's map (when you are able to move around). You should find a treasure chest on top of a building. To open the chest, enter "5150" as a code.
