Portal is FREE on Steam this weekend

Valve promotion coincides with 'Learn with Portals' program

Valve is giving away the original Portal for free on Steam this weekend, as part of its Learn with Portals initiative.

Until September 20 Steam users will be able to download and install either the PC or Mac version of the acclaimed puzzler for absolutely noubt.

You can learn more about Valve's "Learn with Portals" program, in which it's encouraging school kids to create their own levels, via the video below.

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[ SOURCE: RockPaperShotgun ]