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Soundtrack for Sayonara Umihara Kawase aka Yumi's Odd Odyssey

This is an awesome game that has you swinging around with a grappling hook to traverse surreal worlds. They seem to be based on childhood memories growing up by the sea and are complimented by laid-back music. However, the stages are difficult and require a lot of practice. GameCenter CX once featured an Umihara Kawase game, showcasing its unique control and legendary difficulty.

You can get it on 3DS in the American eShop if you are ready for a challenge!