Valve today released a free DLC update for Portal 2. The free Portal 2 DLC is now being rolled out across all regions via Xbox Live for Xbox 360, the PlayStation Network for PS3 and Steam for PC and Mac. The free DLC is called Portal 2: Peer Review.
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.
In semi-related news, Valve has made Portal 2 available for 50% off via Steam. The sale runs through this Thursday at 4pm PST.