PSA: Portal 2's 'Peer Review' DLC now available, full game for half price on Steam

It may have missed it's planned "summer" launch window, but Portal 2's first, totally free DLC "Peer Review" is being made available to download today via Xbox Live, PlayStation Network, and Valve's own Steam distribution service. As previously detailed, the content delivers a brand new co-op track for everybody's favorite anthropomorphic duo, and once again features everybody's favorite murderous robot.

And hey, if for some crazy reason you don't already own Portal 2, we're not sure we can continue this relationship. But we've got a way you can get things fixed up: pick up the game on the cheap right now, for just $14.99 (that's 50 percent off, folks).
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FREE PORTAL 2 DLC SHIPPING TODAY
"Portal 2: Peer Review" Available on PC, Mac, PS3 and Xbox 360
October 4, 2011 -- 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 best-selling game franchise Portal 2 is now being rolled out across all regions on Steam, Xbox LIVE and PSN. The free DLC, titled "Portal 2: Peer Review", is available to all owners of Portal 2 for download on PS3 and Xbox 360, and will be automatically downloaded via Steam on PC and Mac.
In "Peer Review", you and a friend 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 free 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 celebrate the release of the free DLC, Portal 2 is now on sale for 50% off on Steam through Thursday at 4pm PT. For more information on Portal 2, visit http://thinkwithportals.com/. For more information on Steam, please visit http://www.steampowered.com.

This article was originally published on Joystiq.