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It consisted of finding Portal 2 references in the 13 indie games of the pack The Potato Sack.
 April 5, 2011
Two images can be found hidden in the informational video Aperture Investment Opportunity #3: "Turrets" uploaded by Valve on their YouTube channel on April 5, 2011, at the 38th second.
Here's Da Beens, Dougtato:
You found many.
Find the rest.
Another image shows turrets and code of the text "Also... superdinoman's mom".
What follows is the TGAs found in the files of the Potato Sack games.
- Valve ARG Network - dedicated to gathering all the information provided by the PotatoFoolsDay ARG