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Portal
($10)
Portal™ is a new single player game from Valve. Set in the mysterious Aperture Science Laboratories, Portal has been called one of the most innovative new games on the horizon and…
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Portal 2
($10)
The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
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Source SDK Base 2007
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Source SDK
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Portal 2 Authoring Tools
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Portal 2 Publishing Tool
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