'The Final Hours of Portal 2' iPad App Takes Users Behind the Scenes at Valve

LOS ANGELES, April 21, 2011 /PRNewswire/ -- Journalist Geoff Keighley is proud to announce 'The Final Hours of Portal 2' App for iPad is now available on the App Store, giving users a behind-the-scenes look at the blockbuster game's creation. 'The Final Hours of Portal 2,' created to take full advan

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