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Playstation 2 - Shin Megami Tensei - Nocturne cheats

Debug-Mode 
While in a terminal, replace Nocturne for another playstation 2 
game. Exit from the terminal and when the debug screen pops up, 
put the original Notcurne disc back. 

Completed game
Finish the entire game and save. Begin a new game with your 
clear saved game file. You can play with the Demonic Compendium, 
you can change costumes, and there is no level limitation on 
summons and fusions. You can change between 1st person 
and 3rd person view, by pressing Select.