Author: Puzzle King Publishing
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
Book Description
Futoshiki Puzzle Book If you like Sudoku or Kakuro but want a different challenge then you will love Futoshiki. Futoshiki or "More or Less", is a logic puzzle game from Japan. Its name means "inequality". Futoshiki is played on a square grid. The objective is to place the numbers 1 to X (Where X is the length of the grid) in each row, ensuring that each column also only contains the digits 1 to X. This Futoshiki Puzzle Book is a fun way for teens or adults to sharpen their minds and test their logic. Including 192 Puzzles of varying difficulty to keep you entertained for hours. There are three grid sizes 5x5, 7x7 and 9x9. Book Features: Loads of Puzzles 60 Easy, 66 Medium and 66 Hard Large print - Plenty of Space Suitable for all Levels Beginner to Expert Perfectly Sized - 7" x 10" Premium Matte Color cover design Puzzle King Publishing: Puzzle Books for Everyone!
Futoshiki Puzzle Book for Adults
Author: Puzzle King Publishing
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
Book Description
Futoshiki Puzzle Book If you like Sudoku or Kakuro but want a different challenge then you will love Futoshiki. Futoshiki or "More or Less", is a logic puzzle game from Japan. Its name means "inequality". Futoshiki is played on a square grid. The objective is to place the numbers 1 to X (Where X is the length of the grid) in each row, ensuring that each column also only contains the digits 1 to X. This Futoshiki Puzzle Book is a fun way for teens or adults to sharpen their minds and test their logic. Including 192 Puzzles of varying difficulty to keep you entertained for hours. There are three grid sizes 5x5, 7x7 and 9x9. Book Features: Loads of Puzzles 60 Easy, 66 Medium and 66 Hard Large print - Plenty of Space Suitable for all Levels Beginner to Expert Perfectly Sized - 7" x 10" Premium Matte Color cover design Puzzle King Publishing: Puzzle Books for Everyone!
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
Book Description
Futoshiki Puzzle Book If you like Sudoku or Kakuro but want a different challenge then you will love Futoshiki. Futoshiki or "More or Less", is a logic puzzle game from Japan. Its name means "inequality". Futoshiki is played on a square grid. The objective is to place the numbers 1 to X (Where X is the length of the grid) in each row, ensuring that each column also only contains the digits 1 to X. This Futoshiki Puzzle Book is a fun way for teens or adults to sharpen their minds and test their logic. Including 192 Puzzles of varying difficulty to keep you entertained for hours. There are three grid sizes 5x5, 7x7 and 9x9. Book Features: Loads of Puzzles 60 Easy, 66 Medium and 66 Hard Large print - Plenty of Space Suitable for all Levels Beginner to Expert Perfectly Sized - 7" x 10" Premium Matte Color cover design Puzzle King Publishing: Puzzle Books for Everyone!
Sudoku X 9x9 - Easy to Extreme - Volume 1 - 276 Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1502909367
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 9x9 - Easy to Extreme is a collection of 276 puzzle: 54 easy Sudoku X 9x9 puzzle 54 medium Sudoku X 9x9 puzzle 54 hard Sudoku X 9x9 puzzle 54 extreme Sudoku X 9x9 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: 1502909367
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 9x9 - Easy to Extreme is a collection of 276 puzzle: 54 easy Sudoku X 9x9 puzzle 54 medium Sudoku X 9x9 puzzle 54 hard Sudoku X 9x9 puzzle 54 extreme Sudoku X 9x9 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.
Japanese Logic Puzzles
Author: Somatomint
Publisher: Independently Published
ISBN:
Category :
Languages : en
Pages : 144
Book Description
Improve Your Mental Focus, Boost Your Brain Powers and enjoy your time solving the Challenging logic puzzles. This Puzzle Book has 9 different types of logic puzzles (Total 380 Logic puzzles) that will kill the boredom by the many variations. 9 different types of Japanese logic puzzles that will make your brain sweat. Instructions and examples are given inside the book for each puzzle type, some you'll be familiar with and others will be new and enjoyable. 48 Sudoku Puzzles in 4 difficulty levels from easy to medium 48 Futoshiki Puzzles in 4 difficulty levels from easy to medium 48 Tridoku Puzzles in 4 difficulty levels from easy to medium 48 Killer Sudoku Puzzles in 4 difficulty levels from easy to medium 48 Slitherlink (9x9) Puzzles in 4 difficulty levels from easy to medium 48 Masyu (9x9) Puzzles in 4 difficulty levels from easy to medium 36 Hashi or bridges Puzzles (mixed grids) 40 Kakuro puzzles 16 Nonogram or Hanjie or picture cross Puzzles (easy to medium) Features: Size: 8 x 11.5 inch (large size) with softcover and paperback binding so easy store and use. Pages: 143 pages with 380 different puzzles. Plus the solutions of all the puzzles at the end. Logic Puzzles have been scientifically proven to improve mental focus, sharpen the memory as well as protecting the brain from neurodegenerative disorders. It is a unique gift for anyone who is in love with numbers and puzzles. Stretch your brain with this unique selection of challenging, fun puzzles, and games. Scroll up and order your copy.
Publisher: Independently Published
ISBN:
Category :
Languages : en
Pages : 144
Book Description
Improve Your Mental Focus, Boost Your Brain Powers and enjoy your time solving the Challenging logic puzzles. This Puzzle Book has 9 different types of logic puzzles (Total 380 Logic puzzles) that will kill the boredom by the many variations. 9 different types of Japanese logic puzzles that will make your brain sweat. Instructions and examples are given inside the book for each puzzle type, some you'll be familiar with and others will be new and enjoyable. 48 Sudoku Puzzles in 4 difficulty levels from easy to medium 48 Futoshiki Puzzles in 4 difficulty levels from easy to medium 48 Tridoku Puzzles in 4 difficulty levels from easy to medium 48 Killer Sudoku Puzzles in 4 difficulty levels from easy to medium 48 Slitherlink (9x9) Puzzles in 4 difficulty levels from easy to medium 48 Masyu (9x9) Puzzles in 4 difficulty levels from easy to medium 36 Hashi or bridges Puzzles (mixed grids) 40 Kakuro puzzles 16 Nonogram or Hanjie or picture cross Puzzles (easy to medium) Features: Size: 8 x 11.5 inch (large size) with softcover and paperback binding so easy store and use. Pages: 143 pages with 380 different puzzles. Plus the solutions of all the puzzles at the end. Logic Puzzles have been scientifically proven to improve mental focus, sharpen the memory as well as protecting the brain from neurodegenerative disorders. It is a unique gift for anyone who is in love with numbers and puzzles. Stretch your brain with this unique selection of challenging, fun puzzles, and games. Scroll up and order your copy.
Sudoku X 9x9 Deluxe - Extreme - Volume 12 - 468 Logic Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1505667860
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! Sudoku X is a fun and addicting logic puzzle game. This book is ideal if you are a Sudoku X expert. In this book, you find the most extreme Sudoku X 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 X 9x9 Deluxe - Extreme is a collection of 468 puzzle: 408 extreme Sudoku X 9x9 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: 1505667860
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! Sudoku X is a fun and addicting logic puzzle game. This book is ideal if you are a Sudoku X expert. In this book, you find the most extreme Sudoku X 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 X 9x9 Deluxe - Extreme is a collection of 468 puzzle: 408 extreme Sudoku X 9x9 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 12x12 - Hard to Extreme - Volume 8 - 276 Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1503364283
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 12x12 - Hard to Extreme is a collection of 276 puzzle: 108 hard Sudoku X 12x12 puzzle 108 extreme Sudoku X 12x12 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: 1503364283
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 12x12 - Hard to Extreme is a collection of 276 puzzle: 108 hard Sudoku X 12x12 puzzle 108 extreme Sudoku X 12x12 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 10x10 - Hard to Extreme - Volume 7 - 276 Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1503364208
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 10x10 - Hard to Extreme is a collection of 276 puzzle: 108 hard Sudoku X 10x10 puzzle 108 extreme Sudoku X 10x10 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: 1503364208
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 10x10 - Hard to Extreme is a collection of 276 puzzle: 108 hard Sudoku X 10x10 puzzle 108 extreme Sudoku X 10x10 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.
Modelling Puzzles in First Order Logic
Author: Adrian Groza
Publisher: Springer Nature
ISBN: 3030625478
Category : Mathematics
Languages : en
Pages : 344
Book Description
Keeping students involved and actively learning is challenging. Instructors in computer science are aware of the cognitive value of modelling puzzles and often use logical puzzles as an efficient pedagogical instrument to engage students and develop problem-solving skills. This unique book is a comprehensive resource that offers teachers and students fun activities to teach and learn logic. It provides new, complete, and running formalisation in Propositional and First Order Logic for over 130 logical puzzles, including Sudoku-like puzzles, zebra-like puzzles, island of truth, lady and tigers, grid puzzles, strange numbers, or self-reference puzzles. Solving puzzles with theorem provers can be an effective cognitive incentive to motivate students to learn logic. They will find a ready-to-use format which illustrates how to model each puzzle, provides running implementations, and explains each solution. This concise and easy-to-follow textbook is a much-needed support tool for students willing to explore beyond the introductory level of learning logic and lecturers looking for examples to heighten student engagement in their computer science courses.
Publisher: Springer Nature
ISBN: 3030625478
Category : Mathematics
Languages : en
Pages : 344
Book Description
Keeping students involved and actively learning is challenging. Instructors in computer science are aware of the cognitive value of modelling puzzles and often use logical puzzles as an efficient pedagogical instrument to engage students and develop problem-solving skills. This unique book is a comprehensive resource that offers teachers and students fun activities to teach and learn logic. It provides new, complete, and running formalisation in Propositional and First Order Logic for over 130 logical puzzles, including Sudoku-like puzzles, zebra-like puzzles, island of truth, lady and tigers, grid puzzles, strange numbers, or self-reference puzzles. Solving puzzles with theorem provers can be an effective cognitive incentive to motivate students to learn logic. They will find a ready-to-use format which illustrates how to model each puzzle, provides running implementations, and explains each solution. This concise and easy-to-follow textbook is a much-needed support tool for students willing to explore beyond the introductory level of learning logic and lecturers looking for examples to heighten student engagement in their computer science courses.
Futoshiki 6x6
Author: Clarity Media
Publisher: Createspace Independent Pub
ISBN: 9781481138437
Category : Games
Languages : en
Pages : 72
Book Description
Welcome to Fantastic Futoshiki 6x6! This enjoyable sudoku variant is a simple but entertaining little puzzle that is sure to provide you with hours of satisfying puzzle-solving fun. All 100 futoshiki puzzles in this book are on a 6x6 grid size so are the ideal puzzle for those who have started off solving 5x5 puzzles and are now looking for something a little larger. The rules of 6x6 futoshiki are outlined below: - Place each number from 1 - 6 exactly once in each row and column in the 6x6 futoshiki grid - In addition, observe the greater than and less than signs. These are placed in between certain adjacent cells, and indicate that the number placed in one cell is greater than or less than the neighbouring cell. The '>' sign is a greater than sign, whilst the ' 2 whilst 1 That's all there is to it! Armed with just these few simple rules and requirements, each puzzle can be solved and you'll be able to reach the unique solution for each puzzle through the application of logical rules alone: you won't ever need to guess. And all solutions are provided at the back of the book for the 100 puzzles. Also available on Amazon in our futoshiki range are puzzles in 5x5, 7x7 and 8x8 grid sizes, so there is something for every futoshiki solver.
Publisher: Createspace Independent Pub
ISBN: 9781481138437
Category : Games
Languages : en
Pages : 72
Book Description
Welcome to Fantastic Futoshiki 6x6! This enjoyable sudoku variant is a simple but entertaining little puzzle that is sure to provide you with hours of satisfying puzzle-solving fun. All 100 futoshiki puzzles in this book are on a 6x6 grid size so are the ideal puzzle for those who have started off solving 5x5 puzzles and are now looking for something a little larger. The rules of 6x6 futoshiki are outlined below: - Place each number from 1 - 6 exactly once in each row and column in the 6x6 futoshiki grid - In addition, observe the greater than and less than signs. These are placed in between certain adjacent cells, and indicate that the number placed in one cell is greater than or less than the neighbouring cell. The '>' sign is a greater than sign, whilst the ' 2 whilst 1 That's all there is to it! Armed with just these few simple rules and requirements, each puzzle can be solved and you'll be able to reach the unique solution for each puzzle through the application of logical rules alone: you won't ever need to guess. And all solutions are provided at the back of the book for the 100 puzzles. Also available on Amazon in our futoshiki range are puzzles in 5x5, 7x7 and 8x8 grid sizes, so there is something for every futoshiki solver.
Sudoku X 10x10 - Easy to Extreme - Volume 2 - 276 Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1502909510
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 10x10 - Easy to Extreme is a collection of 276 puzzle: 54 easy Sudoku X 10x10 puzzle 54 medium Sudoku X 10x10 puzzle 54 hard Sudoku X 10x10 puzzle 54 extreme Sudoku X 10x10 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: 1502909510
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 10x10 - Easy to Extreme is a collection of 276 puzzle: 54 easy Sudoku X 10x10 puzzle 54 medium Sudoku X 10x10 puzzle 54 hard Sudoku X 10x10 puzzle 54 extreme Sudoku X 10x10 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.
Sudoku X 9x9 - Hard to Extreme - Volume 6 - 276 Puzzles
Author: Nick Snels
Publisher: PuzzleBooks.net
ISBN: 1503364186
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 9x9 - Hard to Extreme is a collection of 276 puzzle: 108 hard Sudoku X 9x9 puzzle 108 extreme Sudoku X 9x9 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: 1503364186
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 9x9 - Hard to Extreme is a collection of 276 puzzle: 108 hard Sudoku X 9x9 puzzle 108 extreme Sudoku X 9x9 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.