"Four members of each tribe will race to unwind ribbons from a very tall pole, releasing a set of keys. They will then use those keys to release the other four tribe members, who must then solve a Klotski puzzle. The first tribe to get their crate on the finish platform wins immunity and reward." ~ @SurvivorWiki
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They also win pillows, blankets, a hammock, and a mat!
Proceed to tribe events.