Sudoku is the new number puzzle craze sweeping the nation, and Sudoku X is the only puzzle collection to add diagonal play to the Sudoku formula.

From Nikoli, the Japanese puzzle company that created the sudoku craze, comesa title that starts at hard and goes to a level of difficulty not seen in anyprevious books.

Catch the latest wave in Sudoku-mania! These 275 X-Factor SuDoku puzzles are for the diagonally challenged, in 6 difficulty levels from Simple to Fiendish. X-Factor puzzles follow the same rules as for regular SuDoku puzzles PLUS the two shaded diagonal regions also contain the numbers 1 to 9 once only. Each X-Factor puzzle is joined to a previous and following puzzle through common puzzle solution numbers. As well, this book is an extension of "The World's Longest SuDoku Puzzle", now at 1,271 puzzles in length. Includes strategy guide for solving SuDoku puzzles, and tips on how to find X-Factor numbers. And for those who still can't get enough, try solving 275 riddles! Joe Defries is a current 2-time Guinness World Record holder, and is the joe in suJoku.com & joe-ks.com (the Largest Source of Internet Humour). Betcha Can't Beat That!* * re Joe's 'super-human puzzling feat' - the World's Longest SuDoku Marathon - as published in "The Addict's Guide to Everything Sudoku" by Fiorella Grossi, Fair Winds Press, 2007

A simple understandng of the Sudoku X-Cycle technique to help those Sudoku enthusiast solve those more challenging Sudoku puzzles! After reading this you will understand how to recognize, construct, and utilize X-cycles for candidate (X) eliminations to help you solve the more challenging Sudoku puzzles!

Challenge your brain, have a fun time, and fight the boredom with the mega Diagonal Sudoku challenging puzzles. This Sudoku activity book includes 120 puzzles of 16x16 Sudoku X from Hard to Extreme with instructions, examples, and solutions. Plus Bonus Puzzles of a different type of Sudoku at the end of the book. What is 16 x16 Diagonal Sudoku X puzzle? 16 x16 Diagonal Sudoku X has 16x16 squares. Each row, column, Diagonal cells, and block (surrounded by bold lines) should contain all numbers from 1 to 16 No number is repeated in any row or column or block or in a diagonal line. Why will you love this book? Scientific research has shown that solving logic puzzles as Sudoku keeps your mind sharp, improves memory, and enhances problem-solving skills. 16x16 Diagonal Sudoku X book has four challenging levels, from Hard to extremely hard. One Puzzle per page in a large font makes it easy to read and will not strain the eyes. Wide margins for your calculations and work to solve the puzzles. Plus the solutions to all the puzzles included at the end of the book. BONUS Puzzles: 6 Diagonal Samurai Sudoku Puzzles. Features: Size: 8.5x11 inches (large size) with softcover and paperback binding. Pages: 155 pages with 120+ different puzzles and the solutions of all the puzzles at the end. Imagine the fun and challenging hours you'll spend solving these challenging puzzles! Scroll up and order your copy.

If you want to learn the basics of playing Sudoku puzzles quickly and easily for newbies and beginners, then get this "How To Play Sudoku" guide. In this step-by-step guide, you will rep the following benefits: - Be familiar with the the game rules. - Learn the basic way of doing Sudoku. - Get useful tips in solving Sudoku puzzle. - Be able to solve Sudoku puzzle in the shortest time possible. - Learn how to appropriately choose a candidate. - Solve different levels of Sudoku puzzle. - Amaze your friends and family to your new found hobby of solving sudoku. - And much more! Click "Buy Now" to get it now!

Sudoku X also called Diagonal Sudoku.The puzzle is a 6x6 grid made up of 3x2 subgrids (called "regions").Some cells already contain numbers, known as "givens".The goal is to fill in the empty cells, one number in each, so that each column, row, region and diagonal contains the numbers 1 through 6 exactly once.Each number in the solution therefore occurs only once in each of three "directions", hence the "single numbers" implied by the puzzle's name.

Packed with more than a hundred color illustrations and a wide variety of puzzles and brainteasers, Taking Sudoku Seriously uses this popular craze as the starting point for a fun-filled introduction to higher mathematics. How many Sudoku solution squares are there? What shapes other than three-by-three blocks can serve as acceptable Sudoku regions? What is the fewest number of starting clues a sound Sudoku puzzle can have? Does solving Sudoku require mathematics? Jason Rosenhouse and Laura Taalman show that answering these questions opens the door to a wealth of interesting mathematics. Indeed, they show that Sudoku puzzles and their variants are a gateway into mathematical thinking generally. Among many topics, the authors look at the notion of a Latin square--an object of long-standing interest to mathematicians--of which Sudoku squares are a special case; discuss how one finds interesting Sudoku puzzles; explore the connections between Sudoku, graph theory, and polynomials; and consider Sudoku extremes, including puzzles with the maximal number of vacant regions, with the minimal number of starting clues, and numerous others. The book concludes with a gallery of novel Sudoku variations--just pure solving fun! Most of the puzzles are original to this volume, and all solutions to the puzzles appear in the back of the book or in the text itself. A math book and a puzzle book, Taking Sudoku Seriously will change the way readers look at Sudoku and mathematics, serving both as an introduction to mathematics for puzzle fans and as an exploration of the intricacies of Sudoku for mathematics buffs.

The present book aims to provide systematic and reliable techniques, called the global solution, for Sudoku puzzles. Any proper Sudoku puzzle, which has one and only one solution of Sudoku, can be solved by anyone following the techniques provided in this book. Specific symbols are introduced to express the 6 basic rules of the Sudoku global solution, as the results, those Sudoku solving techniques are presented similar to the annotations in chess. Finnish mathematician Arto Inkala proposed 'the most difficult Sudoku puzzle' in 2007. Then, he designed another difficult Sudoku puzzle in 2012, named 'the thing Everest'. In the present book the solving process of those two difficult Sudoku puzzles are illustrated reliably by the specific symbols of the global solution step by step.

When you buy this book you get an electronic version (PDF file) of the interior of this book. You can play the puzzles in this book on your mobile phone! Jigsaw Sudoku is Sudoku with a twist. Instead of square shaped regions, the regions are irregularly shaped. This makes solving a Jigsaw Sudoku puzzle that little bit more difficult than Sudoku. This book is ideal if you are a Jigsaw Sudoku expert. In this book, you find the most extreme Jigsaw Sudoku puzzle ever. Once you pick up this book, you won't be able to put it back down. You have been warned! Only 1 large print puzzle per page, with lots of white space for scribbling. Jigsaw Sudoku 9x9 - Extreme is a collection of 276 puzzle: 216 extreme Jigsaw Sudoku 9x9 puzzle 60 extra logic puzzle I guarantee that every logic puzzle in this Jigsaw Sudoku puzzle book has been carefully checked to ensure that each puzzle has only 1 solution. None of the puzzle in this book will appear in any of the other English PuzzleBooks.net books. Jigsaw Sudoku is also known as Geometry Sudoku, Irregular Sudoku, Squiggly Sudoku, Kikagaku Nanpure.