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PlayStation 3Xbox 360
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.
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The typical time comes from the diary. Per category, it is the median time reported by people who finished it and, without enough answers, the diary time.
