Get Portal free on Steam until Sept. 20

This is a treat. Valve is offering hit first-person puzzle game Portal for free starting Friday, until Sept. 20. You can grab your copy of Portal for Mac (or PC) on Steam. If you haven't played Portal, great. If you have, it's worth playing again.

Source: http://gigaom.com/apple/get-portal-free-on-steam-until-sept-20/

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