The first in a new series: hard puzzles for serious sudoku solvers. Do you have what it takes? These 200 challenging sudoku puzzles from Will Shortz will keep your mind sharp! Features: - 200 hard puzzles - Big grids for easy solving - Introduction by legendary Puzzlemaster Will Shortz

200+ supercharged Sudoku to test your skills--and boost your brainpower! Whether you're already a pro or you're looking to build your abilities, The Toughest Sudoku Puzzle Book will challenge and entertain you with hours of mind-bending fun. Of all the Sudoku puzzle books, this one's action-packed with 240 clever, creative Sudoku puzzles, plus complete explanations of 14 fail-proof solving techniques to guarantee your success. Unlike standard Sudoku puzzle books, this book contains 18 variations to keep your brain engaged and your pencil sharp. Difficulty increases throughout, culminating in a bonus chapter that will stretch the minds of even the most advanced players. Finally, a helpful hints section provides 3 clues per puzzle to get you over any hurdle. This extraordinary standout among Sudoku puzzle books includes: Level up--Test your problem-solving skills with three epic levels of difficulty, including tough, tougher, and even tear-your-hair-out! Vexing variety--Tackle a wide range of Sudoku types like Twodoku, Jigsaw, Nonconsecutive, and Samurai, which you won't find in other Sudoku puzzle books. Secrets revealed--Discover how to play smarter with 14 basic, intermediate, and advanced techniques designed for Sudoku puzzle books players of all levels. Since it's one of the most challenging Sudoku puzzle books on the planet, this book will blow your mind!

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.

When you buy this book you get an electronic version (PDF file) of the interior of this book. Become a master in solving Samurai Sudoku. After solving all the puzzles in this book, you will be a Samurai Sudoku Pro. You start with easy Samurai Sudoku puzzles and you gradually build your way up to extremely hard Samurai Sudoku puzzles. Once you pick up this book, you won't be able to put it back down. You have been warned! Only 1 Samurai Sudoku puzzle per page, with lots of white space for scribbling. Samurai Sudoku consists of five 9x9 grids, one in the center and the other 4 overlapping each corner grid of the central one. For each 9x9 grid the goal is to fill in the empty cells, one number in each, so that each column, row, and region contains the numbers 1-9 exactly once. Samurai Sudoku - Easy to Extreme is a collection of 159 puzzles: 30 easy Samurai Sudoku puzzles 30 medium Samurai Sudoku puzzles 30 hard Samurai Sudoku puzzles 30 extreme Samurai Sudoku puzzles 39 extra logic puzzles I guarantee that every logic puzzle in this Samurai Sudoku puzzle book has been carefully checked to ensure that each puzzle has only 1 solution. None of the puzzles in this book will appear in any of the other PuzzleBooks.net books. Samurai Sudoku is also known as Gattai-5.

These sudoku are LOCO! Solvers who enjoy shaking things up a little will go crazy over these 83 challenging puzzles. Each one actually includes five overlapping sudoku, all with different variants. In order to finish the entire thing, you'll have to keep on jumping back and forth between the five. It's out-of-control fun!

I've listened to your requests. Finally, a book full of IQ Killer Sudoku puzzles and a few INSANE. Nothing easier than that! One puzzle per page. No other explanation needed. You wanted fiendish killer sudoku puzzles, I delivered. The ball is in your court. Or, rather, the book. And the pencil. Play!

Essential reading for students of Japanese society, An Introduction to Japanese Society now enters its third edition. Here, internationally renowned scholar, Yoshio Sugimoto, writes a sophisticated, yet highly readable and lucid text, using both English and Japanese sources to update and expand upon his original narrative. The book challenges the traditional notion that Japan comprises a uniform culture, and draws attention to its subcultural diversity and class competition. Covering all aspects of Japanese society, it includes chapters on class, geographical and generational variation, work, education, gender, minorities, popular culture and the establishment. This new edition features sections on: Japan's cultural capitalism; the decline of the conventional Japanese management model; the rise of the 'socially divided society' thesis; changes of government; the spread of manga, animation and Japan's popular culture overseas; and the expansion of civil society in Japan.