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...Well, all the articles here are, in a way. But this one moreso, and the article may contain incomplete information and editor's notes.
Ao Oni is a Japanese horror puzzle game made in the RPG XP engine.
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Version 1.1 has two unused audio tracks.
Background music used in another popular RPG Maker game, Ib.
A unused track of the 1.1 version
Version 1.1 has one item in the game's data that is never used, the scissors (はさみ hasami?). It seems the player would find this item after Kazuya attaches the rope ladder to climb down into the underground tunnel, and during the time where Hiroshi and Megumi are heading toward the exit. The scissors were used to cut down the ladder in the final segment of the game. However, it was never implemented.