Geoff Keighley's 'The Final Hours of Portal 2' now available on Steam

The $1.99 download features 15,000 words and a variety of multimedia supplements, including 360-degree panoramic photos of Valve's office; audio from Jonathan Coulton's song in various stages of development; a puppet-able Wheatley; and an interactive portal diagram. Among the reveals teased in promotional text are "that Portal 2 actually began as a prequel to the first game without portals or GLaDOS," and "video of a never-before-disclosed project, Two Bots, One Wrench."

May 17, 2011

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Associate Editor, Digital at PC Gamer