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Summary
Portal 2: Peer Review includes an additional course for Portal 2 co-op campaign, dubbed "Art Therapy"; as well as Challenge Mode for both single-player or multiplayer campaign, where players can play specific levels and compete in friends/worldwide leader-board.
| Release Date | October 4, 2011 |
| Publisher | Valve |
| Content Rated | E10+ (Everyone 10+) |
| Game Modes | Single player |
| Player Perspectives | First person |
| Genres | Puzzle, Adventure |
| Themes | Comedy |
| Platforms | PlayStation 3, Xbox 360 |
