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More Detail $9.99 on Steam

Portal 2

Overwhelmingly Positive (99% of 465k)
Released Apr 18, 2011 · by Valve

The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!

SingleplayerPlatformerPuzzleFirst-PersonDark HumorStory RichPuzzle PlatformerFunny

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