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Submission + - Portal Available For Free (

tsj5j writes: In celebration of Steam's recent Mac release, Valve has made Portal completely free till May 24th with no strings attached (besides the requirement of the free Steam client). This isn't a trial, you get to keep it as long as you download it within the promotional period. As Portal has scored great reviews from critics, it's certainly worth a download.
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Portal Available For Free

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I have a theory that it's impossible to prove anything, but I can't prove it.