"Each castaway will stack a series of blocks on a multi-leveled platform while avoiding trip wires, which could cause their blocks to tip and force them to start over. The goal is to arrange the blocks so they will fall like dominoes. Ultimately, this releases a ball, which will smash a tile. The winner of the duel will live to see another day on Redemption Island." ~ @SurvivorWiki
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Andrea and Ralph compete.
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Ralph wins the duel and remains on redemption island.
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Andrea leaves the game.
Proceed to the immunity challenge.