Portal 2 - IGN
Portal 2 sold better on PC than Xbox 360 or PS3 – Destructoid
Portal 2 PC Review | TweakTown
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Valve talks Portal 2 on PlayStation 3, Steam on 360 | Ars Technica
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Portal 2: Co-op Splitscreen Multiplayer Gameplay Walkthrough - CALIBRATION COURSE | Part 1 - YouTube
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Portal 2 gets cross-platform play across PC, Mac and PlayStation 3 | WIRED UK
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Official Portal 2 Website - About
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Portal 2 (360) on XBOX ONE! Backward Compatibility TEST. - YouTube
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Proposed early game release opens portal of disappointment | The Baylor Lariat
Portal 2 gets co-op, heading to Xbox 360 and PC | Engadget
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Co-Optimus - News - How to Play Portal 2 Split Screen on Your PC
Amazon.com: Orange Box - Xbox 360 : Video Games
Portal 2 Codes, Cheats and Tips List (PC, Mac, Xbox 360) - Video Games Blogger
