Absolutely Nasty® Sudoku Level 4

Absolutely Nasty® Sudoku Level 4

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.)

Mensa Absolutely Nasty Sudoku Level 5

Mensa Absolutely Nasty Sudoku Level 5

This is it—puzzles so amazing that they’ll make your brain explode! Only the best of the best need apply to work through such skills as: Jellyfish; One-Sided Gordonian Polygon; Multi-Digit One-Sided Gordonian Rectangle; and Turbot Fish. Plus, in this case, they’re used in combination to create the ultimate test.

Mental_Floss Sudoku

It's the Brain Candy You've Been Craving!

Mental_Floss Sudoku

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, they're perfect for helping solvers build their skills.

Sit and Solve No-Sweat Sudoku

Sit and Solve No-Sweat Sudoku

If you want easy sudoku that's also easy to take on the go, Sit & Solve No-Sweat Sudoku is right up your alley. Sudoku sensei Frank Longo has crafted 60 gentle logical conundrums, none of which require upper-level solving techniques to conquer. Grab a pencil and give your brain a stretch with Sit & Solve No-Sweat Sudoku.

Puzzlewright Guide to Solving Sudoku

Hundreds of Puzzles Plus Techniques to Help You Crack Them All

Puzzlewright Guide to Solving Sudoku

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 these tricks: hidden pairs, naked pairs, X-wings, jellyfish, squirmbag, bivalue and bilocation graphs, and chains, plus the exclusive Gordonian logic methods that turn the toughest puzzles into a breeze. There are hundreds of sudoku to practice on. A special addition is a reprint of the very first sudoku ever published!