Portal 2 - Wikipedia

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File:Portal 2 ad on a King County Metro bus in Bellevue, WA.jpg - Wikipedia

Portal 2 - Portal Wiki

Wikipedia continues to have separate mobile and desktop sites. Why?, by Jon Robson (David Lyall), Down the Rabbit Hole

File:Portal 2 (double-deck) bus ad.jpg - Wikipedia

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Portal:Video games/Picture/2 - Wikipedia