This game is phenomenal and is easily the best game i have played in quite a while. I haven't replayed a rhythm game this much since Coolie Niato was still around!
the crystal cavers spot with the 3 broken bridges the chest you get for fully lighting that part of the map's chest keeps respawning giving you the same items 3 milk and 2 curly horns
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Most of the little boxes only pop up if you haven't figured stuff out on your own.