Friday Valve Software's Doug Lombardi sent over an email (in BIG TEXT) announcing that the first DLC pack for Portal 2 will be free and rolled out on October 4, 2011 for the Xbox 360, PlayStation 3, Windows PC and Mac. Called Portal 2: Peer Review, the content will be automatically downloaded via Steam on PC and Mac -- console owners will need to manually download the add-on via their respective networks.
In "Peer Review," gamers and their friends will continue the story of loyal bots P-Body and Atlas as they puzzle their way through a mysterious new co-op test track and once again match wits with GLaDOS. The DLC also features a single player and co-op Challenge Mode, and leaderboards to compare Challenge Mode scores with friends and the Portal community.
"To hold you over until the release next week, visit here for the final installment of the Portal 2 soundtrack Music to Test By," Valve said.
Valve's first-person puzzle-platform game Portal 2 originally launched on all four platforms on April 19, 2011. Players assume the role of Chell in the single-player campaign, and as one of two robots, Atlas and P-Body, in the co-operative campaign. The Xbox 360 version is the only one that doesn't include Valve's Steamworks distribution platform, leaving Xbox 360 owners out in the cold while gamers on the other three enjoy cross-platform, co-op gameplay.