Portal 2 is a Platformer, Dark Humor, Puzzle PC game, developed by , available on Steam and published by .
The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
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Platformer Dark Humor Puzzle Puzzle Platformer First-Person Story Rich Female Protagonist Funny 3D Platformer Action-Adventure FPS Action Co-op Physics Level Editor Sci-fi Science Atmospheric Comedy Adventure