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Portal 2: Best Community Co-Op Maps To Try

Portal 2's dedicated community creates maps & mods thanks to Valve's modding support. Popular user-generated content includes single-player and co-op maps for varying challenges. Community favorites ...
Kotaku

Portal 2: Peer Review

All the Latest Game Footage and Images from Portal 2: Peer Review Portal 2: Peer Review includes an additional course for Portal 2 co-op campaign, dubbed "Art Therapy"; as well as Challenge Mode for ...