Geoff Keighley's interactive app on the development of Portal 2 is no longer an iPad exclusive. Portal 2: The Final Hours is now available for Mac and PC via Valve's Steam service for $1.99 USD.
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Geoff Keighley's interactive app on the development of Portal 2 is no longer an iPad exclusive. Portal 2: The Final Hours is now available for Mac and PC via Valve's Steam service for $1.99 USD.