The progress bars at the page are time based, with different games requiring a different overall time investment based on the number of gamers that own the games. Straight from the source, this confirmation is all the reason you need to drop everything you're doing and start playing some indie developed video games. Anyone accomplishing this feat by the time Portal 2 launches will receive a very special, non-hat-based reward.' 'There's also still time to collect all 36 potatoes. So why not get a taste of Portal 2 now while you help launch it?' 'The Potato Sack games are all great, and each one has also received a massive Portal-themed update. Your efforts will be tracked on the official page.' What does that mean? From now until release, play any or all of the Potato Sack games to expedite the launch of Portal 2. The more CPU power dedicated to the process, the faster it will finish. It's not too late to participate, though. Thanks to the efforts of a dedicated group of ingenious test subjects, we've located enough potatoes to generate the required power to start the GLaDOS reboot process. It's not clear if this early release will be just for Steam, but an early retail release seems unlikely. According to an announcement on the Steam community page, playing games featured in the Potato Sack Pack could help expedite the release of Portal 2. It's only natural then that Valve's own concept of reverse-Valve-time might come into play here as a reward for a community that really loves their Portal-driven puzzle game. Those who have been following Valve's Portal 2 alternate reality game (ARG) have no doubt been impressed with the sheer complexity of its puzzle, and with so many people dedicated to the cause of solving it, Valve must be impressed with those who've participated.

Portal 2 potato