UPDATE: Portal Is Free Until 20th September - This News Is No Lie! And It's Moist, Delicious & Tasty

UPDATE: Okay so it turns out that Portal is free only until September 20th. So get the game NOW!

Oh dear, no announcement regarding this. But Rock Paper Shotgun spotted that Valve's classic Portal, is now available for free on Steam. So if you've somehow not played Portal, you now can. Go ahead and download Portal here. It's free for both the PC and Mac.

Source: Rock Paper Shotgun