Valve announced that Portal 2 will allow PC and PS3 gamers to play cooperatively together via Steam.

Portal 2 PC PS3 cross platform game steam valve
Portal 2 PC PS3 cross platform game steam valve
Portal 2 PC PS3 cross platform game steam valve

Click here to read the related article,
http://www.joystiq.com/2011/04/13/portal-2-for-ps3-steam-details-steam-cloud-steam-play-steam-y/

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