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indigoFrank Longo

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Spiral Bound

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Top solvers can try their hand at the One-Sided Gordonian Rectangle; Extended Gordonian Rectangle; Gordonian Polygon; and Alternating Digits. (But they can take comfort in knowing that no more than one will occur in any single puzzle.)
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Only diehards need apply! These incredibly difficult sudoku are made to challenge even the most expert solver…and strain their brains to bursting. Each puzzle requires upper-level strategies that have been honed to perfection from regular practice. Designed…

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For diehards only! These incredibly difficult puzzles are handcrafted for the sudoku warrior who dares to go where other solvers fear to tread. So, if you're armed with the highest-level strategies, get ready for the most satisfying fight your life.   It's…

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Sudoku designers the world over will weep and gnash their teeth at the revelations in this comprehensive guide to cracking the addictive puzzles--but solvers will find it absolutely invaluable as they seek to improve their skills. Even experts don't know all…
Hardcover

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Endless fun for devoted solvers! At 21 feet, 9 ¾ inches long, and with 8,929 empty squares to fill, this huge puzzle adds big excitement to the popular game—and is the perfect challenge for fans who find regular sudoku too easy. It’s composed…
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Paperback

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Paperback

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Bigger IS better! Created by one of the best puzzle makers in the business, this giant collection (more than 850 pages!) features hundreds and hundreds of sudoku. The puzzles range from easy to challenging, and offer a ton of fun for solvers of every level. With…
Spiral Bound

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$8.32 online

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They just don't get any harder than this! These are the roughest, toughest, NASTIEST crosswords ever concocted. Wordplay connoisseurs looking to climb the Mt. Everest of puzzles know: completing these puts them at the peak of solving success!
Spiral Bound

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$8.83 online

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Even more interaction—this time used in combination with other proceduresand a lot more heavily than in the first book.

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Sudoku fever is on! Which book in the Martial Arts Sudoku series will provide the perfect challenge for you? The skill level recommended to solve these puzzles is ranked in the same way as Japanese karate levels—by different colored belts. Easy sudokus bore…