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indigoFrank Longo


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Spiral Bound

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Sudoku super-master Frank Longo and mental_floss , the magazine for trivia lovers, bring fans a collection of superb puzzles sure to stimulate the brain. Longo's puzzles are always top-notch, and because these increase in difficulty as the book goes along,…

Spiral Bound

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The vast majority of sudoku puzzles that are labeled "hard," "expert," "challenger," are not really all that difficult. And in a surprising number of cases, they are downright easy. In the "Mensa Absolutely Nasty Sudoku" books, you will find puzzles truly worthy…

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.)

Spiral Bound

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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 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…

Paperback

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Hardcover

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The two longest crosswords ever created—now together for the first time! Amazingly, in spite of their massive size, these puzzles follow the rules of standard American crosswords: full interlock, no repeated answers, symmetrical patterns of black squares,…

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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…

10 X 10 Sudoku

by Frank Longo

|August 4, 2015

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Sudoku fans always keep an eagle eye out for fresh formats featuring their favorite puzzles. Here’s one sure to draw them in: 210 sudoku that add a little spice to the mix by changing the standard 9 x 9 puzzles to 10 x 10. That means solvers get 100 squares…

Spiral Bound

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The difficulty level soars, as even more tricks get added to the mix: X-Wing; Swordfish; XY-Wing; XYZ-Wing; and the Gordonian Rectangle.

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Get ready for some mental madness with these mind-meltingly cunning crosswords. Frank Longo, one of the best puzzle masters in the business, has crafted clues that will have even the most experienced solvers tearing their hair out!

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Here it comes: a revolution in sudoku solving! This is by far the most complete guide to cracking these addictive puzzles ever produced, with tricks even the experts won’t know. While most books might have a few pages of introduction before proceeding…