Portal 3 Official Trailer

URL: http://www.celebritynetworth.com/watch/8snnkKYdcAU/portal-3-official-trailer/

1. 

   Portal 3 Announcement

   June 7, 2010

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2. 

   Half Life 3 Demo Gameplay

   August 17, 2010

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3. 

   PORTAL GUN IN REAL LIFE! - Aperture Science Prototype

   June 30, 2011

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