CheatCodes.com has all the official Disgaea 2: Dark Hero Days PSP cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Friday May 24, 2013 for Disgaea 2: Dark Hero Days are shown below.
First, you have to unlock the Cave of Ordeals. Then get to stage 4. There are 2 rows of 4 puppets in an EXP +100% and mana +100% box, with several unused spaces. Get in one of the squares, and kill them all off. I did this with the monster's level about 500 and I went from 467 to nearly 600 after just a few battles.
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