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Sudoku Xtra books are all language-independent logic puzzle compilations, available in two versions:
1) A PDF file to download and print yourself
2) Pre-printed in large book format (10"x8") from Amazon.com and Lulu.com
Lulu print locally in many countries, including the UK; outside the US they are usually the cheapest option

Published 06/11/11 Christmas Hanjie: 50 Festive 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: £4.99 Pre-printed: Amazon.com (US $9.95) Lulu (UK £6.95)
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: £3.99 Pre-printed: Amazon.com (US $9.95) Lulu (UK £5.99)
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: £3.99 Pre-printed: Amazon.com (US $9.95) Lulu (UK £5.95)
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: £3.99 Pre-printed: Amazon.com (US $9.95) Lulu (UK £5.95)
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: £3.99 Pre-printed: Amazon.com (US $9.99) Lulu (UK £5.99)
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: £3.99 Pre-printed: Amazon.com (US $9.95) Lulu (UK £5.95)
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: £3.99 Pre-printed: Amazon.com (US $9.95) Lulu (UK £5.95)
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: £3.99 Pre-printed: Amazon.com (US $9.95) Lulu (coming soon)
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: £3.99 Pre-printed: Amazon.com (US $9.95) Lulu (UK £5.95)
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: £3.99 Pre-printed: Amazon.com (US $9.95) Lulu (coming soon)
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: £3.99 Pre-printed: Amazon.com (US $9.99) Lulu (UK £5.99)
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: £3.99 Pre-printed: Amazon.com (US $9.95) Lulu (UK £5.95)
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: £3.99 Pre-printed: Amazon.com (US $9.95) Lulu (UK £5.95)
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: £3.99 Pre-printed: Amazon.com (US $9.95) Lulu (UK £5.95)