Enter the following to unlock the corresponding effect.

Unlock Back Yard Stage 1:
YARDBASH

Unlock Park Stage 2:
MYPICNIC

Unlock Sushi Joint Stage 3:
SUSHIYUM

Unlock Arcade Stage 4:
GAMERIRL

Unlock Forest by the Beach Stage 5:
BEACHFUN

Anywhere Stage 6:
MYCHOICE

Unlock Flute:
UYSHOICE

Unlock Necklace:
UYSHOKE

Unlock Race Flag:
UYCHOICE