Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1502454084
Category : Games & Activities
Languages : en
Pages : 181
Book Description
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! Become a master in solving Sudoku. After solving all the puzzle in this book, you will be a Sudoku Pro. You start with easy Sudoku puzzle and you gradually build your way up to extremely difficult Sudoku puzzle. 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. Large Sudoku 12x12 - Easy to Extreme is a collection of 276 puzzle: 54 easy Sudoku 12x12 puzzle 54 medium Sudoku 12x12 puzzle 54 hard Sudoku 12x12 puzzle 54 extreme Sudoku 12x12 puzzle 60 extra logic puzzle The goal of Sudoku is to fill in the empty cells, one number in each, so that each column, row, and region contains each number exactly once. I guarantee that every logic puzzle in this 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. Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku or Soduku.
Large Sudoku 12x12 - Easy to Extreme - Volume 15 - 276 Puzzles
Jigsaw Sudoku 12x12 - Easy to Extreme - Volume 15 - 276 Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1502903059
Category : Games & Activities
Languages : en
Pages : 181
Book Description
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! Become a master in solving Jigsaw Sudoku. After solving all the puzzle in this book, you will be a Jigsaw Sudoku Pro. You start with easy Jigsaw Sudoku puzzle and you gradually build your way up to extremely difficult Jigsaw Sudoku puzzle. 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 12x12 - Easy to Extreme is a collection of 276 puzzle: 54 easy Jigsaw Sudoku 12x12 puzzle 54 medium Jigsaw Sudoku 12x12 puzzle 54 hard Jigsaw Sudoku 12x12 puzzle 54 extreme Jigsaw Sudoku 12x12 puzzle 60 extra logic puzzle The goal of Jigsaw Sudoku is to fill in the empty cells, one number in each, so that each column, row, and region contains each number exactly once. The regions are of irregular shape. 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.
Publisher: PuzzleBooks.net
ISBN: 1502903059
Category : Games & Activities
Languages : en
Pages : 181
Book Description
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! Become a master in solving Jigsaw Sudoku. After solving all the puzzle in this book, you will be a Jigsaw Sudoku Pro. You start with easy Jigsaw Sudoku puzzle and you gradually build your way up to extremely difficult Jigsaw Sudoku puzzle. 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 12x12 - Easy to Extreme is a collection of 276 puzzle: 54 easy Jigsaw Sudoku 12x12 puzzle 54 medium Jigsaw Sudoku 12x12 puzzle 54 hard Jigsaw Sudoku 12x12 puzzle 54 extreme Jigsaw Sudoku 12x12 puzzle 60 extra logic puzzle The goal of Jigsaw Sudoku is to fill in the empty cells, one number in each, so that each column, row, and region contains each number exactly once. The regions are of irregular shape. 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.
Classic Sudoku For Kids 9x9 - Hard - Volume 15 - 145 Logic Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1539031934
Category : Games & Activities
Languages : en
Pages : 99
Book Description
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! Sudoku is a fun and addicting logic puzzle game. Sudoku is ideal to introduce your child to inequality signs and logical thinking. Sudoku teaches your child logical thinking and deductive reasoning skills, even at a young age. Sudoku improves critical thinking and making quick decisions based upon available evidence. Sudoku is a brain game that helps to train the brain of your child. In addition, Sudoku demands attention to detail - noticing patterns, spotting opportunities, and finding the right moment to make a move. Sudoku is not only fun and interesting – it might just help prepare your kids for better success in school and in life. Only 1 large print puzzle per page, with lots of white space for scribbling. Classic Sudoku For Kids 9x9 - Hard is a collection of 145 puzzle: 124 hard Sudoku 9x9 puzzle 21 extra logic puzzle I guarantee that every logic puzzle in this 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. Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku or Soduku.
Publisher: PuzzleBooks.net
ISBN: 1539031934
Category : Games & Activities
Languages : en
Pages : 99
Book Description
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! Sudoku is a fun and addicting logic puzzle game. Sudoku is ideal to introduce your child to inequality signs and logical thinking. Sudoku teaches your child logical thinking and deductive reasoning skills, even at a young age. Sudoku improves critical thinking and making quick decisions based upon available evidence. Sudoku is a brain game that helps to train the brain of your child. In addition, Sudoku demands attention to detail - noticing patterns, spotting opportunities, and finding the right moment to make a move. Sudoku is not only fun and interesting – it might just help prepare your kids for better success in school and in life. Only 1 large print puzzle per page, with lots of white space for scribbling. Classic Sudoku For Kids 9x9 - Hard is a collection of 145 puzzle: 124 hard Sudoku 9x9 puzzle 21 extra logic puzzle I guarantee that every logic puzzle in this 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. Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku or Soduku.
Taking Sudoku Seriously
Author: Jason Rosenhouse
Publisher: Oxford University Press
ISBN: 0199913153
Category : Mathematics
Languages : en
Pages : 227
Book Description
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.
Publisher: Oxford University Press
ISBN: 0199913153
Category : Mathematics
Languages : en
Pages : 227
Book Description
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.
Sudoku 15x15 Deluxe - Easy to Extreme - Volume 28 - 468 Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1502531429
Category : Games & Activities
Languages : en
Pages : 293
Book Description
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! Become a master in solving Sudoku. After solving all the puzzle in this book, you will be a Sudoku Pro. You start with easy Sudoku puzzle and you gradually build your way up to extremely difficult Sudoku puzzle. 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. Sudoku 15x15 Deluxe - Easy to Extreme is a collection of 468 puzzle: 102 easy Sudoku 15x15 puzzle 102 medium Sudoku 15x15 puzzle 102 hard Sudoku 15x15 puzzle 102 extreme Sudoku 15x15 puzzle 60 extra logic puzzle The goal of Sudoku is to fill in the empty cells, one number in each, so that each column, row, and region contains each number exactly once. I guarantee that every logic puzzle in this 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. Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku or Soduku.
Publisher: PuzzleBooks.net
ISBN: 1502531429
Category : Games & Activities
Languages : en
Pages : 293
Book Description
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! Become a master in solving Sudoku. After solving all the puzzle in this book, you will be a Sudoku Pro. You start with easy Sudoku puzzle and you gradually build your way up to extremely difficult Sudoku puzzle. 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. Sudoku 15x15 Deluxe - Easy to Extreme is a collection of 468 puzzle: 102 easy Sudoku 15x15 puzzle 102 medium Sudoku 15x15 puzzle 102 hard Sudoku 15x15 puzzle 102 extreme Sudoku 15x15 puzzle 60 extra logic puzzle The goal of Sudoku is to fill in the empty cells, one number in each, so that each column, row, and region contains each number exactly once. I guarantee that every logic puzzle in this 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. Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku or Soduku.
Sudoku 15x15 - Easy - Volume 23 - 276 Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1502523795
Category : Games & Activities
Languages : en
Pages : 181
Book Description
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! Sudoku is a fun and addicting logic puzzle game that has taken the world by storm. This book is ideal for beginners to learn Sudoku. 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. Sudoku 15x15 - Easy is a collection of 276 puzzle: 216 easy Sudoku 15x15 puzzle 60 extra logic puzzle The goal of Sudoku is to fill in the empty cells, one number in each, so that each column, row, and region contains each number exactly once. I guarantee that every logic puzzle in this 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. Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku or Soduku.
Publisher: PuzzleBooks.net
ISBN: 1502523795
Category : Games & Activities
Languages : en
Pages : 181
Book Description
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! Sudoku is a fun and addicting logic puzzle game that has taken the world by storm. This book is ideal for beginners to learn Sudoku. 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. Sudoku 15x15 - Easy is a collection of 276 puzzle: 216 easy Sudoku 15x15 puzzle 60 extra logic puzzle The goal of Sudoku is to fill in the empty cells, one number in each, so that each column, row, and region contains each number exactly once. I guarantee that every logic puzzle in this 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. Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku or Soduku.
Sudoku 15x15 - Extreme - Volume 26 - 276 Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1502530732
Category : Games & Activities
Languages : en
Pages : 181
Book Description
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! Sudoku is a fun and addicting logic puzzle game that has taken the world by storm. This book is ideal if you are a Sudoku expert. In this book, you find the most extreme 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. Sudoku 15x15 - Extreme is a collection of 276 puzzle: 216 extreme Sudoku 15x15 puzzle 60 extra logic puzzle I guarantee that every logic puzzle in this 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. Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku or Soduku.
Publisher: PuzzleBooks.net
ISBN: 1502530732
Category : Games & Activities
Languages : en
Pages : 181
Book Description
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! Sudoku is a fun and addicting logic puzzle game that has taken the world by storm. This book is ideal if you are a Sudoku expert. In this book, you find the most extreme 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. Sudoku 15x15 - Extreme is a collection of 276 puzzle: 216 extreme Sudoku 15x15 puzzle 60 extra logic puzzle I guarantee that every logic puzzle in this 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. Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku or Soduku.
Sudoku 15x15 - Hard - Volume 25 - 276 Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1502524953
Category : Games & Activities
Languages : en
Pages : 181
Book Description
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! Sudoku is a fun and addicting logic puzzle game that has taken the world by storm. This book is ideal if you love to solve difficult Sudoku puzzle. You do not need to wade through tons of easy Sudoku puzzle before getting to the real brain teasers. 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. Sudoku 15x15 - Hard is a collection of 276 puzzle: 216 hard Sudoku 15x15 puzzle 60 extra logic puzzle I guarantee that every logic puzzle in this 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. Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku or Soduku.
Publisher: PuzzleBooks.net
ISBN: 1502524953
Category : Games & Activities
Languages : en
Pages : 181
Book Description
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! Sudoku is a fun and addicting logic puzzle game that has taken the world by storm. This book is ideal if you love to solve difficult Sudoku puzzle. You do not need to wade through tons of easy Sudoku puzzle before getting to the real brain teasers. 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. Sudoku 15x15 - Hard is a collection of 276 puzzle: 216 hard Sudoku 15x15 puzzle 60 extra logic puzzle I guarantee that every logic puzzle in this 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. Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku or Soduku.
Sudoku X 15x15 - Hard to Extreme - Volume 9 - 276 Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1503364305
Category : Games & Activities
Languages : en
Pages : 181
Book Description
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! Become a master in solving Sudoku X. After solving all the puzzle in this book, you will be a Sudoku X Pro. You start with easy Sudoku X puzzle and you gradually build your way up to extremely difficult Sudoku X puzzle. 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. Sudoku X 15x15 - Hard to Extreme is a collection of 276 puzzle: 108 hard Sudoku X 15x15 puzzle 108 extreme Sudoku X 15x15 puzzle 60 extra logic puzzle I guarantee that every logic puzzle in this Sudoku X 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. Sudoku X is also known as Diagonal Sudoku, Kokonotsu, Taikakusen Nanpure, Diagonal Line Number Place, Sudoku-X.
Publisher: PuzzleBooks.net
ISBN: 1503364305
Category : Games & Activities
Languages : en
Pages : 181
Book Description
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! Become a master in solving Sudoku X. After solving all the puzzle in this book, you will be a Sudoku X Pro. You start with easy Sudoku X puzzle and you gradually build your way up to extremely difficult Sudoku X puzzle. 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. Sudoku X 15x15 - Hard to Extreme is a collection of 276 puzzle: 108 hard Sudoku X 15x15 puzzle 108 extreme Sudoku X 15x15 puzzle 60 extra logic puzzle I guarantee that every logic puzzle in this Sudoku X 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. Sudoku X is also known as Diagonal Sudoku, Kokonotsu, Taikakusen Nanpure, Diagonal Line Number Place, Sudoku-X.
Sudoku X 15x15 - Easy to Extreme - Volume 4 - 276 Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 150290957X
Category : Games & Activities
Languages : en
Pages : 181
Book Description
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! Become a master in solving Sudoku X. After solving all the puzzle in this book, you will be a Sudoku X Pro. You start with easy Sudoku X puzzle and you gradually build your way up to extremely difficult Sudoku X puzzle. 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. Sudoku X 15x15 - Easy to Extreme is a collection of 276 puzzle: 54 easy Sudoku X 15x15 puzzle 54 medium Sudoku X 15x15 puzzle 54 hard Sudoku X 15x15 puzzle 54 extreme Sudoku X 15x15 puzzle 60 extra logic puzzle The goal of Sudoku X is to fill in the empty cells, one number in each, so that each column, row, region, and the two main diagonals contain each number exactly once. I guarantee that every logic puzzle in this Sudoku X 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. Sudoku X is also known as Diagonal Sudoku, Kokonotsu, Taikakusen Nanpure, Diagonal Line Number Place, Sudoku-X.
Publisher: PuzzleBooks.net
ISBN: 150290957X
Category : Games & Activities
Languages : en
Pages : 181
Book Description
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! Become a master in solving Sudoku X. After solving all the puzzle in this book, you will be a Sudoku X Pro. You start with easy Sudoku X puzzle and you gradually build your way up to extremely difficult Sudoku X puzzle. 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. Sudoku X 15x15 - Easy to Extreme is a collection of 276 puzzle: 54 easy Sudoku X 15x15 puzzle 54 medium Sudoku X 15x15 puzzle 54 hard Sudoku X 15x15 puzzle 54 extreme Sudoku X 15x15 puzzle 60 extra logic puzzle The goal of Sudoku X is to fill in the empty cells, one number in each, so that each column, row, region, and the two main diagonals contain each number exactly once. I guarantee that every logic puzzle in this Sudoku X 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. Sudoku X is also known as Diagonal Sudoku, Kokonotsu, Taikakusen Nanpure, Diagonal Line Number Place, Sudoku-X.