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Proposed early game release opens portal of disappointment | The Baylor Lariat
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Portal 2 gets co-op, heading to Xbox 360 and PC | Engadget
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Portal 2 sold better on PC than Xbox 360 or PS3 – Destructoid
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Portal 2 gets cross-platform play across PC, Mac and PlayStation 3 | WIRED UK
Portal 2 – review | Games | The Guardian
Portal 2 - Wikipedia
Valve's Portal 2 Headlines Games with Gold for September 2022 - Thurrott.com
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Creating a Port Forward in Your Router for Portal 2
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Portal 2' now available for PC, Xbox 360, PS3 | Digital Trends
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