Valve today announced the release of the free Peer Review DLC update for Portal 2.
"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 https://thinkwithportals.com/."
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