"One by one in pairs, tribes have to make their way up a four-story high tower. On each of the floors, the pairs will throw three crates down the tower that are filled with sandbags. Once all four levels of crates have been thrown down, one pair will collect the sandbags and throw them into six holes. A flag will be raised when the holes are filled." ~ @SurvivorWiki
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They also win flint!
Proceed to tribe events.