"The contestants must answer four questions about the season with numerical answers, then use them to solve a mathematical problem and work out which of ten boxes to untie. They will then find a key, and open a lock to raise their flag. First three move on. In the final round they will solve three more questions, unlock and crawl through a timber tunnel, and cross a line of small pontoons to raise a flag." ~ @SurvivorWiki
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Brad wins immunity!
Proceed to tribe events.