Waking up in a seemingly empty laboratory, the player is made to complete various physics-based puzzle challenges through numerous test chambers in order to test out the new Aperture Science Handheld Portal Device, without an explanation as to how, why or by whom.
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Just about anyone could pick up this game and have fun with it. The concept is so simple yet so fun at the same time. And once you get near the end and start discovering exactly what's going on with this strange place you're in, it's even more engaging