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.
Façade - Power Outage
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Description
This is a concept I'm basing the second map around; the power goes completely out, so you have to carry around a flashlight to see.