It doesn’t matter who you are””young or old, big or small, Fanboy, Trekkie, or Twi–hard — we all love free stuff.

That’s why you’ll be elated to hear that the insanely popular puzzle game from Valve, Portal, is being offered for free on Steam until tomorrow, September 20, 2011. The game is available for both Mac and Windows, and you can find out where to score it by heading below now.