Serious solvers needed to solve these very hard and extremely hard sudoku puzzles. 200 puzzles--100 of each level plus solutions. Warning: Not for beginners.
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Seller: Revaluation Books, Exeter, United Kingdom
Paperback. Condition: Brand New. 254 pages. 9.00x6.00x0.58 inches. In Stock. Seller Inventory # zk1099805821
Quantity: 1 available