Via a fresh press release from Valve, Portal 2's upcoming free DLC "Peer Review" will be available October 4th across all regions on Steam, Xbox LIVE, and PSN.
Playing as the familiar P-Body and Atlas, you and a friend will trek through a "mysterious new co-op test track" where they will "match wits with GLaDOS". It will include a single player and co-op Challenge Mode with leaderboards.
[Image Credit: criis-chan on DeviantArt]
