Portal Free Until Sept. 20

Probably one of the best puzzle games ever, says me.

I know this is a couple of days late, but I figure I'd announce it here as well as all the other social networking sites I frequent, because, well. If you don't already own a copy of Portal, you really are missing out.

VALVe even put out a sweet YouTube video about how educators are starting to use games like Portal and the Hammer editor to learn physics, and things of that nature.

In any case, VALVe has made Portal free until September 20. Yes, all you need is a valid Steam account and you're set. Here's the place, and the pretty interesting YouTube video:

http://learnwithportals.com/