"The castaways would play a variation of shuffleboard. The castaways would start the game with four pucks a piece on the board and would slide another puck to knock their opponent's pucks off the board. The last castaway to have a puck on the board would win." ~ @SurvivorWiki
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Keith and Mark compete.
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Keith wins the duel and remains on redemption island.
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Mark leaves the game.
Proceed to the immunity challenge.