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Portal 2: Pretty Much Every PS3 Question Answered (and that Cake thing, too) – PlayStation.Blog
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Getting Portal 2 for PS3 seemed like a good idea at the time, what with getting it on Steam for free. : r/gaming
How to Link & Play your Portal 2 PS3 Copy on Steam - Just Push Start
Portal 2' gets Steamy on PlayStation 3
Valve talks Portal 2 on PlayStation 3, Steam on 360 | Ars Technica
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Amazon.com: Portal 2 - Playstation 3 : Video Games
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