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Killer Samurai Sudoku vol. 3: 75 puzzles

Paperback
$11.99
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Volume 3: The Ultimate Cage-Sum Gauntlet

Face the ultimate intersection of scale and complexity. This volume fuses the 5-grid overlapping architecture of Samurai Sudoku with the mathematical constraints of Killer Sudoku.

With no starting digits, you must rely entirely on cage sums and the Rule of 45. A rigorous mental workout designed for veteran solvers.