This phase of the ARG appears to be complete, but PortalWiki.net will keep you up to date on any ARG news, and new Portal 2 info as it becomes available.
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Portal 2 Steam Release - April 18, 2011 <countdown time="04/18/2011 8:00 AM UTC-0700"><D> days, <H> hours, <M> minutes and seconds to go</countdown></div>
Portal 2 US Retail Release - April 20, 2011 <countdown time="04/20/2011 8:00 AM UTC-0700"><D> days, <H> hours, <M> minutes and <S> seconds to go</countdown>
Portal 2 European Retail Release - April 22, 2011 <countdown time="04/22/2011 8:00 AM UTC-0700"><D> days, <H> hours, <M> minutes and <S> seconds to go</countdown>
Portal ARG Latest News
June 4, 2010: After discovery of the belonging of garbled SSTV Images to the Flickr account of Adam Foster, we discover that one of the images being the Apollo guidance system, but the other instead is the Herbert, a robot built at MIT in 1987, implementing AI to collect and trash dropped soda cans.
April 26, 2010: The Portal ARG is mentioned in a Gamepro article about ARGs.
March 12, 2010: An Article at The Escapist quotes Jason Holtman as suggesting that there may be more info to find in the Portal ARG.
March 11, 2010: During the GDC Awards Show, Gabe Newell accepted the Pioneer award. In his Acceptance Speech he spoke about the Portal ARG. A BSOD error that appeared during the conference contained a clue stating "SUSPEND UNTIL EEE" (E3).
Portal 2 Latest News
November 18, 2010: Portal 2 delayed to April 20, 2011 for North America and Australia; April 22, 2011 for Europe.