Note:- This game is also known as - Gurumin

Boss Rush Mode - In Boss Rush Mode, you fight all 8 bosses one after another.

To unlock Boss Rush Mode, clear game under Beginner, Normal, Hard, and Happy Mode, head to the last locked house in human town, and enter the password:

English version: LEGENDARY
Japanese version: yarushikanaiwane (in hiragana/katakana)

After clearing Boss Rush Mode under any difficulty, talk to BlackBean and you'll get access to see any movie in this game.

Japanese voice - To unlock original Japanese voice, clear game under any difficulty, start new game, while on the difficulty select screen, hold down the L and R buttons and enter: Left, Up, Right, Down, Left, Up, Right, Down, Left, Up, Right, Down. A sound will play if the code is entered correctly. (Thanks to Jeduthy, for the info).

Play as Popon - To unlock extra character Popon, clear game under Beginner, Normal, Hard, and Happy difficulties. Start new game, get the drill, and go back to town. You'll find her standing in front of Fan's cake shop, talk to her and ask her to switch. Popon use sword as weapon, she can't use any headgear or clothes, but she is powerful.

To change costume, examine dresser on the corner of Parin's room.

Unlockables

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