Mirage Project by Molten Thinker.
http://oni.moltenstudios.com/downloads/index.php

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I've converted the Mirage project by Oni Master to an Anniversary Edition package.

To play you load level 4 of Syndicate Mountain Compound. (chapter 14)

This mod does some changes to your oni files (probably at the time with a Hex Editor), for example it changes the names of difficulty in main menu to Hard, Legendary and Impossible. So if you run in something weird in your game you may want to uninstall this package.

s10k