Gurumin: A Monstrous Adventure Hints & Cheats

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

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.

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 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).