Kuru Kuru Kururin Codes -

Hint: Avoid losing lives:
To prevent a loss of a loss of a life, press Start when you have one heart remaining, and select "Retry". You will go back to the door you went through. This is good for health.

Easy mode:
Press Select in the blue pre-game screen to get a shorter stick.

Bonus levels:
Complete all challenge mode levels and stages with a "Perfect" rank to unlock a bonus challenge mode level with five additional stages.