Portal 2 DLC will be available October 4th. Oh, and it’s free!

If you thought you were done with Portal 2, think again. Starting October 4th, all Portal 2 owners, which means Xbox 360, PS3 and PC will be treated to a new DLC starring our two favorite test bots. Did I mention that it's FREE?! Here is a little about the DLC.

In "Peer Review", you and a friend will continue the story of loyal bots P-Body and Atlas as you puzzle your 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.

Ok in all honesty we were already expecting free DLC since that was one of Valves initial announcements regarding Portal 2, but it's great they followed through with it and you won't have to wait much longer. 360 and PS3 owners can get their DLC on Xbox Live and PSN respectively, and Steam owners will have their DLC downloaded automatically, how convenient.