Portal

You awaken as a girl in a small glass enclosure with nothing but a small stasis pod and toilet for company. A computerized voice, known as GLaDOS, informs you that you are a test subject at the Aperture Science test facility and then rips open a hole in the fabric of the universe to let you out. Thus begins Portal, a 2007 game by Valve that makes you think in ways you've never thought before.

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