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Portal 2 Official Co-Op Gameplay Trailer [HD]
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PlanetXbox360Videos
Video duration: 117 seconds
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![Portal 2 Official Co-Op Gameplay Trailer [HD]](http://img.youtube.com/vi/mjpWFSUHMSQ&feature=youtube_gdata/2.jpg "Portal 2 Official Co-Op Gameplay Trailer [HD]")