Gurumin: A Monstrous Adventure Cheats

Unlockable Costumes
To change costume, examine dresser on the corner of Parin's room:

Armor: Give 30 Gold Medal to Hyperbolic at Beginner Mode
Chinese Dress: Get good ending on Hard mode
Kimono Set: PSP date to January 1~7
Leopard Suit: Get good ending on Crazy mode
Maid Outfit: Buy from vending machine at Spinach Caverns - Shadow Grotto
Monkey Suite: Get good ending on Beginner mode
Normal Clothes: Starts off with this
Nurse Outfit: Clear Boss Rush on Happy difficulty
Pajamas: Get good ending on Normal mode
Princess Dress: Give 30 Gold Medal to Hyperbolic at Normal mode
Samurai Outfit: Give 30 Gold Medal to Hyperbolic at Crazy mode
Santa Outfit: Set PSP date to December 25~31
School Uniform: Get good ending on Happy mode
Swimsuit: Clear Boss Rush on Crazy difficulty
Vampire Outfit: Give 30 Gold Medal to Hyperbolic at Hard mode
Witch Outfit: Give 30 Gold Medal to Hyperbolic at Happy mode
Work Uniform: Clear Boss Rush on Hard difficulty
Workout Gear: Clear Boss Rush on Beginner/Normal difficulty