Frank Longo

Enjoy fantastic sudoku puzzles from a renowned expert with this book that every sudoku lover will flip over. Sudoku super-master Frank Longo and mental_floss, the…

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

Gluttons for punishment rejoice! The popular series of ultra-hard sudoku is back. Just when it seemed safe to go back into the puzzle section of…

Gluttons for punishment rejoice! The popular series of ultra-hard sudoku is back. Just when it seemed safe to go back into the puzzle section of…

Gluttons for punishment rejoice! The popular series of ultrahard sudoku is back. Just when it seemed safe to go back into the puzzle section of…

Gluttons for punishment rejoice! The popular series of ultrahard sudoku is back. Just when it seemed safe to go back into the puzzle section of…

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

A collection of 105 easy to hard sudoku puzzles that will provide a perfect (and perfectly portable) break at any time of the day.

You say you can't get enough sudoku? Challenge accepted!With more than 900 puzzles at all difficulty levels (gradually increasing from easy to medium to hard),…

Go way beyond difficult, with the hardest, most brain-busting sudoku you’ve ever seen! Calling all sudoku-solving diehards: with every puzzle requiring upper-level strategies, this collection…

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…

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…

Are you a sudoku warrior? Now you have an incredible opportunity to reach elite status and bask in the glory of completing some of the…

Lounging by the pool is a great way to spend some leisure time, and great sudoku puzzles make it even better. Whether theyre on a…

Watch out—these sudoku might crush even the most stalwart of solvers!

For confident players only!

The fun begins with subsets and interaction.

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…

Everyone loves sudoku puzzles, finding them impossible to put down. The only problem: having enough sudokus to solve! Created in the United States, these addictive…