Initially slated for summer, Valve's first, free expansion to Portal 2 will be out for PC, Mac, PlayStation 3 and Xbox 360 next week. It's called "Peer Review" and is made for co-op.

"Peer Review" continues the game's co-op storyline, according to Valve. "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 expansion will also include single-player and co-op challenge mode that uses online leaderboards.

You can contact Stephen Totilo, the author of this post, at You can also find him on Twitter, Facebook, and lurking around our #tips page.

Share This Story

Get our newsletter