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Portal 2 on Steam adds split-screen to co-op mode, Big Picture support - Polygon
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Portal 2 - Wikipedia
Portal 2 Splitscreen and Online Co-Op Detailed.
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Amazon.com: Portal 2 - Xbox 360 : Video Games
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Portal 2 gets split-screen and Big Picture support on Steam | Engadget
Portal: Companion Collection Is Out Today on Nintendo Switch - IGN
Portal 2 PC finally gets split-screen co-op | Eurogamer.net
Portal 2 PC - local co-op (splitscreen) gameplay - YouTube
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