Portal 2 sold better on PC than Xbox 360 or PS3 – Destructoid
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Buy Portal 2 | Xbox
Buy Portal 2 | Xbox
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Portal 2 | PS3 vs XBOX 360 vs PC (Which One is Better!) - YouTube
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Portal 2' now available for PC, Xbox 360, PS3 | Digital Trends
Portal 2 – review | Games | The Guardian
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Valve talks Portal 2 on PlayStation 3, Steam on 360 | Ars Technica
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Proposed early game release opens portal of disappointment | The Baylor Lariat
Portal 2 WIN MAC DVD-ROM Video Game | eBay
Buy Portal 2 | Xbox
Portal 2 gets cross-platform play across PC, Mac and PlayStation 3 | WIRED UK
