Successfully complete the game, then choose to start a new game. Then, hold L + R and press Left, Up, Right, Down, Left, Up, Right, Down, Left, Up, Right, Down at the difficulty selection screen. A sound will confirm correct code entry.

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.

Complete the indicated task to unlock the corresponding alternate costume. Use the dresser in the corner of Parin's room to change costumes.

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.