Valve has started their new campaign in form of an ARG. Many, brilliant, PC gamers have banded together and solved various pieces of the puzzle already, but there are tons more.
Take a look at whats been discovered so far. http://forums.lambdascience.com/showthread.php?tid=77
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Other than that read this article. http://www.bit-tech.net/gaming/pc/2010/03/04/the-portal-radio-update-explained/1
I <3 Valve!!!










