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Quote from steam this morning....
w00t! Not sure if there was another post about this... but frankly I don't care... deserves DOUBLEPOST!
If you notice Portal 2 updating today, don't be alarmed: it's only because you're getting the new Portal 2: Peer Review DLC for free. If you don't have a copy of Portal 2 to update, Valve have that covered as well: it's on sale for 50% off through the 6th.
Peer Review adds a new multiplayer test track for robo-buddies P-body and Atlas, and features a single-player and co-op Challenge mode.
Peer Review adds a new multiplayer test track for robo-buddies P-body and Atlas, and features a single-player and co-op Challenge mode.