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Portal 2

Valve · Apr 18, 2011
$9.99
Overwhelmingly Positive (392,557 reviews)
Estimated owners (SteamSpy): 5000000 - 10000000
The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
ActionAdventureSingle-playerMulti-playerCo-opOnline Co-opShared/Split Screen Co-opShared/Split ScreenSteam AchievementsFull controller support
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