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    Image result for portal
    Video game
    Portal is a first-person puzzle-platform video game developed and published by Valve Corporation. Portal was released in a bundle package called The Orange Box for Microsoft Windows and Xbox 360 in ... Wikipedia
    Initial release date: October 9, 2007
    Designer: Kim Swift
    Series: Portal, Half-Life
    Platforms: Android, Microsoft Windows, Linux, PlayStation 3, Xbox 360, Macintosh operating systems, SteamOS