"Four members of each tribe would be blindfolded and push a large money stone through a forest course while being verbally directed by the two other tribe members. Along the course, the money stones would crush four tiles that would reveal a pair of smaller money stones. Three tribe members would then use these eight stones to solve a rotating cog puzzle." ~ @SurvivorWiki
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They win a trip to an island to enjoy a spa and food.
They can send one player from each tribe to exile island.
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They will return before the immunity challenge.
Proceed to exile island.