The M.A.R.T.I. Initiative is a mod for Portal 2 taking place in alternate facility to Aperture Labs during the 1980's, following their attempt to create an AI by the name of M.A.R.T.I.
Fan Concept
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Description
Concept Map by H. Grunt
Great. Now I don't know if a fan of the mod made it, or if it's an actually concept for a fan puzzle. Looks really cool, though.