There's a couple hidden areas in the side scrolling part of Oni Island, both in the upper-left part of said section. One is through a tunnel you can jump up to, behind a hidden wall, leading to a treasure chest. The other is in the same general area, reached by double jumping, then vining to the Konohana Flower, and continuing to ascend up the narrow shaft. Again, a treasure chest can be found at the end of this path, too.
Contributed By: Mookiethebold
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