"Both teams will race to assemble four puzzle wheels and attach them to a cart, in which two of their tribemates will ride. Pushing the cart through a series of obstacles to a finish platform, the tribes will then disassemble the puzzle wheels and use them to complete a turnstile. Finally, they'll wind the turnstile to raise a fire wok, igniting their tribal cauldron. First tribe to finish the task would win the challenge." ~ @SurvivorWiki
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They also win flint!
Proceed to tribe events.