A different sort of "game" app is now available in the App Store. The Final Hours of Portal 2 is not itself a game, but rather a documentary-style story about the development and evolution of the popular multi-platform game, written by tech journalist Geoff Keighley and featuring unprecedented access to developer Valve's offices, programmers and executives. The app combines the 15,000-word story with audio and video clips, photos, panoramas and other interactive elements to delve deep behind the scenes of the game, including never-before-seen prototypes of other games
