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Sudoku Xtra Specials are all language-independent logic puzzle books, each containing just one single type of puzzle. Each book is available in two different ways:
1) A PDF file to download and print yourself
2) Pre-printed in large book format (10"x8") from Amazon

Published 06/11/11 Christmas Hanjie: 50 Festive Picture Puzzles Packed with 50 beautifully-drawn festive picture puzzles, this special Christmas-themed book of Hanjie logic puzzles also includes full solving instructions and an introductory guide to Hanjie puzzles. A holiday season scene or picture is revealed as you solve each puzzle, with a cryptic clue alongside each puzzle to give you a small hint as to what is concealed within. Pre-printed copies are on high-quality 10"x8" (Amazon) or A4-size (Lulu) paper, ideal for solving on, and this book features many large puzzles, including 10 big 30x30 puzzles and 10 even bigger 40x40 puzzles! The puzzles are also ordered in increasing difficulty from front to back, and even tell something of a festive tale.		PDF download: $7.99 Pre-printed: Amazon.com ($9.95)
Published 10/04/12 Consecutive Sudoku Volume 1 Consecutive Sudoku uses the same rules as standard Sudoku but adds in a white bar between all pairs of squares which contain consecutive numbers, such as 1 and 2, or 8 and 9. This simple addition elevates Sudoku to another level, which is why Consecutive Sudoku is one of the most popular variants of all. Packed with 100 beautiful and attractive puzzle designs, this book will provide both delight and a new challenge for anyone who has ever enjoyed a sudoku puzzle. Pre-printed copies are supplied on top-quality, large paper for ease of solving.		PDF download: $7.99 Pre-printed: Amazon.com ($9.95)
Published 23/06/10 Easy Jigsaw Sudoku If you can solve Sudoku then you can solve Jigsaw Sudoku, the puzzle with the twisted regions. The regular 3x3 boxes are replaced with all sorts of weird and wonderful jigsaw shapes, each of which is ready and waiting for 1 to 9 to be fitted into it. There are 100 of these puzzles in this book, each rated 'easy'. All of the puzzles are symmetrical in a wide range of different ways, and every one can be solved without requiring complex logic, so it's suitable even for beginners - but the varied nature of each puzzle means there's a challenge even for experts! (View a sample here)		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 10/08/12 Killer Sudoku 2: 100 easy to hard puzzles and how to solve them Featuring 100 more top-quality Killer Sudoku, this book is packed with another set of challenging puzzles which start at a tougher level than the previous book. Although the book includes difficulty levels that range from easy to hard, easy doesn't mean trivial and hard doesn't mean guessing is needed! Every puzzle in this book will make you think, but they're also always fair. To solve Killer Sudoku, just place 1 to 9 once each into every row, column and box while obeying the dashed-line cage totals. Full instructions and number-table aids are given at the front of the book.		PDF download: $7.99 Pre-printed: Amazon.com ($9.95)
Published 07/08/09 Killer Sudoku: 100 easy to hard puzzles and how to solve them Sudoku no longer a challenge? Then add a Killer twist! Place 1 to 9 into each of the rows, columns and boxes, whilst obeying the dashed-line shape totals. It's as easy as 1 + 2 + 3. This book features 100 top-quality puzzles from Dr Gareth Moore, author of over 20 best selling international puzzle and brain-training titles from a wide range of publishers.		PDF download: $7.99 Pre-printed: Amazon.com ($9.95)
Published 14/08/12 Slitherlink 2: 100 Loop-the-Loop Puzzles and How to Solve Them This book features 100 more top-quality Slitherlink puzzles. Simpler than Sudoku and yet even more fiendish to solve, Slitherlink is probably the most pure logic puzzle ever invented. Can you draw a single loop while obeying the numbers in the grid? Don't visit '0'. Visit '1' 1 time. Visit '2' 2 times. Visit '3' 3 times. The rules are as easy as 1, 2, 3.		PDF download: $7.99 Pre-printed: Amazon.com ($9.95)
Published 14/08/09 Slitherlink: 100 Loop-the-Loop Puzzles and How to Solve Them Simpler than Sudoku. Even more fiendish to solve. Slitherlink is a pure logic puzzle. Can you draw a single loop whilst obeying the numbers in the grid? Don't visit '0'. Visit '1' 1 time. Visit '2' 2 times. Visit '3' 3 times. It's as easy as 1, 2, 3. This book features 100 top-quality puzzles from Dr Gareth Moore, author of over 20 best selling international puzzle and brain-training titles from a wide range of publishers.		PDF download: $7.99 Pre-printed: Amazon.com ($9.99)
Published 21/09/10 Sudoku 12x12 Volume 1 For those who like their Sudoku just a little bit larger, this book of 100 12x12 Sudoku puzzles should fit the bill. Just place 1 to 9 and A to C into each of the 12 rows, columns and 4x3 boxes. With a range of attractive, symmetrical patterns, the 100 mixed difficulty puzzles are printed on large paper for solving convenience.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 10/04/12 Sudoku 12x12 Volume 2 Volume 2 of Sudoku 12x12 brings 100 more 12x12 Sudoku puzzles for those who enjoy the slightly greater challenge of this size of puzzle. Just place 1 to 9 and A to C into each of the 12 rows, columns and 4x3 boxes. With a variety of attractive, symmetrical patterns at a range of mixed difficulties, pre-printed copies are also presented on top-quality, large paper for ease of solving.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 23/07/11 Sudoku 15x15 Volume 1 This first volume of 15x15 Sudoku puzzles from best-selling Sudoku author Dr Gareth Moore offers 50 large and attractive puzzles presented with full rotational, horizontal and vertical symmetry in the given numbers. Designed to be fun rather than frustrating, each puzzle has a guaranteed logical solution which does not require lots of pencilmarks to be made. Just place 1 to 9 and A to F into each of the 15 rows, columns and 5x3 boxes. Printed on large paper, there's plenty of room to solve these puzzles.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 14/02/10 Sudoku 16x16 Volume 1 If you enjoy large Sudoku puzzles then you should love this book. With large pages, and featuring 50 carefully-crafted 16x16 Sudoku, each puzzle has full 8-way symmetry and a guaranteed sensible logical solution. You can complete all of these Sudoku 16x16 simply by scanning the rows, columns and 4x4 boxes, without any requirement to write thousands of tiny pencil marks into the grid. (View a sample here)		PDF download: $6.49 Pre-printed: Amazon.com ($9.99)
Published 02/02/14 Sudoku 16x16 Volume 10 This tenth volume features 50 more 16x16 Sudoku puzzles. Just place 1 to 9 and A to G into each of the 16 rows, columns and 4x4 boxes.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 02/02/14 Sudoku 16x16 Volume 11 This eleventh volume features 50 more 16x16 Sudoku puzzles. Just place 1 to 9 and A to G into each of the 16 rows, columns and 4x4 boxes.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 31/10/14 Sudoku 16x16 Volume 12 Back for a twelfth volume, this book contains 50 more 16x16 Sudoku puzzles. Just place 1 to 9 and A to G into each of the 16 rows, columns and 4x4 boxes.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 31/10/14 Sudoku 16x16 Volume 13 Returning for a thirteenth volume, this book contains 50 more 16x16 Sudoku puzzles. Just place 1 to 9 and A to G into each of the 16 rows, columns and 4x4 boxes.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 17/09/10 Sudoku 16x16 Volume 2 Volume 2 of Sudoku 16x16 brings even more large puzzles for fans of bigger Sudoku. And with each puzzle being 7 inches wide, there's plenty of room to solve on the page too. Each of these 50 carefully-crafted puzzles has full 8-way symmetry and a guaranteed sensible logical solution. All puzzles can be solved by scanning the rows, columns and 4x4 boxes, without any requirement to write pencil marks into the grid. (View a sample of volume 1 here)		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 21/07/11 Sudoku 16x16 Volume 3 This third volume of 16x16 Sudoku puzzles offers another 50 large puzzles with full symmetry and a guaranteed logical solution which does not require lots of pencilmarks to be made. Just place 1 to 9 and A to G into each of the 16 rows, columns and 4x4 boxes. Printed on 8-inch wide paper if bought pre-printed, there's plenty of room to solve these puzzles. (View a sample of volume 1 here)		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 16/10/11 Sudoku 16x16 Volume 4 If you're a fan of big Sudoku puzzles then this is the book for you! With pre-printed copies supplied in large page format, this book is packed with 50 more giant 16x16 Sudoku puzzles, each attractively presented in a range of symmetric patterns. Each puzzle is guaranteed human-solvable - you can complete every Sudoku in the book just by scanning rows, columns and boxes, without having to make any pencil mark notes.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 10/04/12 Sudoku 16x16 Volume 5 Returning for a fifth volume due to popular demand, Sudoku 16x16 Volume 5 contains 50 more attractively-designed large 16x16 Sudoku puzzles. Every puzzle can be solved just by observation - you don't need to make any pencilmark notes in the grid if you don't want to. At this size of puzzle that's really important! Just place 1 to 9 and A to G into each of the rows, columns and 4x4 boxes. Pre-printed copies are on top-quality, large paper.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 10/07/12 Sudoku 16x16 Volume 6 Back for a sixth volume thanks to continuing demand, Sudoku 16x16 Volume 6 contains 50 more attractively-designed large 16x16 Sudoku puzzles. Every puzzle can be solved just by observation - you don't need to make any pencilmark notes in the grid if you don't want to. At this size of puzzle that's really important! Just place 1 to 9 and A to G into each of the rows, columns and 4x4 boxes. Pre-printed copies are on top-quality, large paper.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 10/07/12 Sudoku 16x16 Volume 7 Returning again for a seventh volume due to sustained demand, Sudoku 16x16 Volume 7 contains 50 more attractively-designed large 16x16 Sudoku puzzles. Every puzzle can be solved just by observation - you don't need to make any pencilmark notes in the grid if you don't want to. At this size of puzzle that's really important! Just place 1 to 9 and A to G into each of the rows, columns and 4x4 boxes. Pre-printed copies are on top-quality, large paper.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 23/08/13 Sudoku 16x16 Volume 8 This eighth volume features 50 more 16x16 Sudoku puzzles. Just place 1 to 9 and A to G into each of the 16 rows, columns and 4x4 boxes.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 23/08/13 Sudoku 16x16 Volume 9 This ninth volume features 50 more 16x16 Sudoku puzzles. Just place 1 to 9 and A to G into each of the 16 rows, columns and 4x4 boxes.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 23/07/11 Sudoku 18x18 Volume 1 If you like large Sudoku puzzles then why not try Sudoku 18x18? It's just a bit bigger than 16x16 but it changes from having 4x4 boxes into having 6x3 boxes instead, with letters A to R to be placed into every row, column and box. Each of the 50 Sudoku puzzles in this book is attractively presented in a range of symmetric patterns. All puzzles are guaranteed sensibly human-solvable - you can complete every Sudoku in the book without having to make any pencil mark notes, if you like!		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 25/11/11 Sudoku 20x20 Volume 1 This first volume of 20x20 Sudoku puzzles from best-selling Sudoku author Dr Gareth Moore provides 50 extra-large and attractive puzzles at the unusual size of 20x20. To solve these Sudoku just place A to T into every row, column and 5x4 box. Attractively presented with full rotational, horizontal and vertical symmetry in the given numbers, every puzzle is designed to be fun rather than frustrating with a guaranteed logical solution which does not require lots of pencilmarks to be made. With pre-printed copies supplied on large, high-quality paper, there's plenty of room to solve these puzzles.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 05/02/10 Sudoku 25x25 Volume 1 If you're a fan of giant Sudoku puzzles then this is the book for you! With a full large page used for each puzzle, this book is packed with 50 huge 25x25 Sudoku puzzles. Each Sudoku 25x25 is attractively presented in a range of symmetric patterns. All puzzles are guaranteed sensibly human-solvable - you can complete every Sudoku in the book just by scanning rows, columns and boxes, without having to make any pencil mark notes. (View a sample here)		PDF download: $6.49 Pre-printed: Amazon.com ($9.99)
Published 02/02/14 Sudoku 25x25 Volume 10 This tenth volume of giant Sudoku puzzles brings you 50 more enormous 25x25 Sudoku puzzles, all guaranteed to be human-solvable - you can complete all of the puzzles just by scanning rows, columns and boxes, without having to make any pencil mark notes. Just place A-Y once each into every region.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 02/02/14 Sudoku 25x25 Volume 11 This eleventh volume of giant Sudoku puzzles brings you 50 more enormous 25x25 Sudoku puzzles, all guaranteed to be human-solvable - you can complete all of the puzzles just by scanning rows, columns and boxes, without having to make any pencil mark notes. Just place A-Y once each into every region.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 31/10/14 Sudoku 25x25 Volume 12 This twelfth volume of giant Sudoku puzzles contains 50 further enormous 25x25 Sudoku puzzles, all guaranteed to be human-solvable - you can complete all of the puzzles just by scanning rows, columns and boxes, without having to make any pencil mark notes. Just place A-Y once each into every region.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 31/10/14 Sudoku 25x25 Volume 13 Back again for a thirteenth volume of giant Sudoku puzzles, this book contains 50 more 2x25 Sudoku puzzles, all guaranteed to be human-solvable - you can complete all of the puzzles just by scanning rows, columns and boxes, without having to make any pencil mark notes. Just place A-Y once each into every region.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 21/09/10 Sudoku 25x25 Volume 2 This second volume of giant 25x25 Sudoku puzzles is packed with another 50 huge 25x25 Sudoku puzzles. And it's not just the Sudoku that are huge - at over 7 inches wide each puzzle is physically large too! All of the carefully-crafted symmetrical puzzles are guaranteed human-solvable - you can complete every Sudoku in the book just by scanning rows, columns and 5x5 boxes, without having to make any pencil marks. (View a sample of volume 1 here)		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 21/07/11 Sudoku 25x25 Volume 3 There are 50 more giant 25x25 Sudoku puzzles in this third volume, printed on 8-inch-wide paper if bought pre-printed. Place A to Y into each row, column and 5x5 box to solve each carefully-crafted 8-way symmetrical puzzle. All puzzles are guaranteed human-solvable - in fact you can complete every Sudoku in the book without having to make any temporary pencil mark notes. (View a sample of volume 1 here)		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 25/11/11 Sudoku 25x25 Volume 4 If you're a fan of giant Sudoku puzzles then this is the book for you! Designed to print full page, or with pre-printed copies supplied in large page format on high-quality paper, this book is packed with 50 enormous 25x25 Sudoku puzzles. Every puzzle is attractively presented in a range of symmetric patterns, and all are guaranteed to be human-solvable - you can complete every Sudoku in the book just by scanning rows, columns and boxes, without having to make any pencil mark notes.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 10/04/12 Sudoku 25x25 Volume 5 Back by popular demand, this fifth volume of giant Sudoku puzzles brings you 50 more enormous 25x25 Sudoku puzzles, with each puzzle attractively presented in a range of symmetric patterns. Every sudoku in the book is guaranteed to be human-solvable - you can complete all of the puzzles just by scanning rows, columns and boxes, without having to make any pencil mark notes. Pre-printed copies are in large page format on top-quality paper.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 10/07/12 Sudoku 25x25 Volume 6 Returning again to meet demand for these gigantic puzzles, this sixth volume of giant Sudoku puzzles brings you 50 more enormous 25x25 Sudoku puzzles, with each puzzle attractively presented in a range of symmetric patterns. Every sudoku in the book is guaranteed to be human-solvable - you can complete all of the puzzles just by scanning rows, columns and boxes, without having to make any pencil mark notes. Pre-printed copies are in large page format on top-quality paper.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 10/07/12 Sudoku 25x25 Volume 7 Returning again to meet demand for these gigantic puzzles, this sixth volume of giant Sudoku puzzles brings you 50 more enormous 25x25 Sudoku puzzles, with each puzzle attractively presented in a range of symmetric patterns. Every sudoku in the book is guaranteed to be human-solvable - you can complete all of the puzzles just by scanning rows, columns and boxes, without having to make any pencil mark notes. Pre-printed copies are in large page format on top-quality paper.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 23/08/13 Sudoku 25x25 Volume 8 This eighth volume of giant Sudoku puzzles brings you 50 more enormous 25x25 Sudoku puzzles, all guaranteed to be human-solvable - you can complete all of the puzzles just by scanning rows, columns and boxes, without having to make any pencil mark notes. Just place A-Y once each into every region.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)
Published 23/08/13 Sudoku 25x25 Volume 9 This ninth volume of giant Sudoku puzzles brings you 50 more enormous 25x25 Sudoku puzzles, all guaranteed to be human-solvable - you can complete all of the puzzles just by scanning rows, columns and boxes, without having to make any pencil mark notes. Just place A-Y once each into every region.		PDF download: $6.49 Pre-printed: Amazon.com ($9.95)