Portal 2' now available for PC, Xbox 360, PS3 | Digital Trends
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Portal 2 and one other are now free to download on Xbox | TheXboxHub
Portal 2 mod adds third portal with time travel | Eurogamer.net
Classic Valve Titles Now in Enhanced Xbox 360 Backward Compatibility Collection - Xbox Wire
Best games like Portal and Portal 2 for mind-bending puzzles | GamesRadar+
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Portal 2 was released a decade ago, so here are 10 facts about Valve's classic puzzle game | Rock Paper Shotgun
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Portal 2 Xbox 360 Box Art Cover by MountianMan41
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