Successfully complete the game and save when prompted after the credits. Load the cleared saved game file. Go to the entrance of the prison and talk to the guard. Select the first response when he asks if you are a true adventurer. The monsters will become more challenging. To have them return to their normal difficulty, talk to the guard again and select the second response.
Duplicate items
Note: This trick requires two PSPs with their own copy of the game. Start a Co-op mode game with the other PSP. Complete the game and trade. Send all your items to the other PSP, then quit the game without saving. Your items will all be on the first PSP, while their copies will be available on the second PSP.
Duplicate money
Note: This trick requires two PSPs with their own copy of the game. Start a Versus mode game with the other PSP. Offer all your money. Intentionally lose and quit without saving the game. You will not lose all your money, and the second PSP will still have the amount given.
Monster becomes Super strong
Beat the game and at the end of the credits, you will have a choice to save. Save and load your game. Go to the entrance of the prison and talk to the guard. He will ask if your a true adventurer. Select the first option and the monster will becomes stronger than normal. Talk to the guard again and select the 2nd option to return the monsters to normal.
MP recharge at the inn
Whenever characters need MP, go to the inn, do not rest, just go upstairs walk around. You must walk around by knocking in too the furniture, and slowly... your MP would be recharge!
Ten Development Points
When you first create a character and give it a name if you use 9 characters to create the name you will be given 10 points to add to anything you want.