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Nine years ago, Matt Filer officially began work on the OpenCAGE mod tools for Alien: Isolation—following two-and-a-half years of work on prototype versions. During that time the tools have been available for anyone to use, which is part of the reason Creative Assembly's legendarily scary horror game has a variety of mods already. (Though the VR mod works differently, since it's actually enabling an unfinished mode that shipped with the game.)