Dewy's Adventure: Suishou Dewy no Daibouken!!
This game is titled Dewy's Adventure in North America and Dewy's Adventure: Suishou Dewy no Daibouken!! in Japan.
Successfully complete Groovy Grasslands to have the
following options appear in the village in Story mode: Character
Gallery, Hall of Records, Music Gallery, Photo Gallery, and Tips
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Dewy's theme song, called "Rainbow Smile" in the game, can be unlocked in the Music Gallery after completing the game. You can then listen to it at any time.