Soul Eater: Battle Resonance Cheats - PSP
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Unlock Characters
Complete Arcade mode to unlock Free and Ox and Harvar.
Unlock Costumes
Beat arcade mode and then press [L]+[O] at the selection menu.
Unlock Excaliber
After you beat Adventure Mode, Enter Adventure mode again. You will get more people to fight. After you beat 49, go to the Cave where Excaliber is. You will see Battle 50 there. Watch him do his dance (you don't have a choice :-D) and Beat Excaliber 5 times in a row and he will be available.