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Pleased with the idea of educators using Portal to teach students mathematics, Valve has decided to offer the game up for free. Of course, this is for a limited time, meaning you’d better act quickly. September twentieth is the cut-off day to get this great deal on a very well-loved puzzler.
This free download is limited to your computer type of choice: PC or Mac.
Enjoy. Sorry we don’t have any cake for you.
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