"The tribes will select one member of each team to act as their eyes while the other members are blindfolded. Sitting atop two towers, the eyes must guide their blindfolded tribe members through a series of obstacles, such as: stacking wooden beams and filling up buckets of water. The first tribe to successfully complete the course wins." ~ @SurvivorWiki
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They win a feast of Mountain Dew and Doritos.
Proceed to the immunity challenge.