Valve, creators of best-selling game franchises (such as Half-Life and Counter-Strike) and leading technologies (such as Steam and Source), today announced the free DLC update for its bestselling game franchise Portal 2 will be rolled out across all regions on Steam, Xbox LIVE and PSN starting October 4th. The free DLC, titled "Portal 2: Peer Review", is available to all owners of Portal 2 fo... more.