Steam Offering Portal Free Until September 20
As part of a games and learning initiative from Valve, Portal is being offered for free download via stream. If you don't already own the original Portal, this is a great time to check it out. All you need to do is download and install the game before the expiration date (September 20th), and it's yours to keep forever. This download works for both PC and Mac version.
This is all part of Valve's "Learn With Portals" program, where they enoucrage kids to create Portal levels themselves. Valve describes the program as "Using interactive tools like the Portal series to draw them in makes physics, math, logic, spatial reasoning, probability, and problem-solving interesting, cool, and fun which gets us one step closer to our goal—engaged, thoughtful kids!" Learn more about this amazing program in the video below or visit the Learn With Portals site.