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1: Sudoku Variants

2: Different Symbols

3: Different Grid Sizes/Shapes

4: Sudoku X

5: Samurai Sudoku

6: Killer Sudoku

7: Multiplayer Sudoku

Another variation on Sudoku is to overlap multiple puzzle grids.

For example, imagine two overlapping 9 X 9 Sudokus which share a 3 X 3 box. In this case, the contents of that 3 X 3 box could be deduced using clues from either of the puzzles, and likewise numbers in that 3 X 3 box could help you solve either of the Sudokus.

The most common version of overlapping Sudoku puzzles, is Samurai Sudoku. In Samurai Sudoku (also known as Gettai-5), five overlapping 9 X 9 Sudokus are arranged in an X shape (thus there are four 3 X 3 boxes which are shared between Sudokus).

Samurai Sudoku can be a lot of fun, as it adds a new challenge. You'll find that you can't simply solve one 9 X 9 grid and then move to the next - instead you have to switch between grids as you go, because of the subtle interactions caused by the overlapping boxes.

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The Way of Samurai: 105 Samurai Sudoku puzzles

By DJ APE CreateSpace Released: 2008-08-20 Paperback (126 pages)	List Price: $9.95 Lowest New Price: $9.95 Usually ships in 24 hours (As of 09:09 Pacific 12 Oct 2008 More Info) Click Here
Product Description: Volume 2 of the book that has already reached thousands of readers worldwide. This time along with 80 Samurai Sudokus you will find 25 Jigsaw Samurai puzzles which require new solving methods and are even more satisfying! This book comes directly from the creator of The Washington Post's weekly Samurai Sudoku puzzles.

100 Samurai Sudoku Puzzles 2

By Peter Greene

Greene Hill Publishing Limited
Paperback (136 pages)

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Product Description:
Sudoku is the number-placing puzzle that is spreading across the world, engaging the minds of people of all ages. The rules are simple, you don't need to know any mathematics, all you need is logic. Samurai Sudoku puzzles are like traditional Sudoku puzzles but with five interlocking Sudoku grids. This book contains 100 of these massive puzzles, including solutions. All the Samurai Sudoku puzzles in this book are symmetric. The rule is the same: Each row, column and 3x3 box in each puzzle grid must contain the numbers 1-9 only once. All puzzles in this book are hard, however the puzzles get progressively harder and the puzzles at the end may be considered very hard. This book is for those who feel ordinary Sudoku puzzles are too easy or too quick to solve and want more challenging puzzles. These puzzles can take hours to solve and if you solve two of these every week this book will last you a year! Have fun!

100 Samurai Sudoku Puzzles

By Peter Greene

Greene Hill Publishing Limited
Paperback (136 pages)

List Price: $9.99
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Samurai Sudoku puzzles are like traditional Sudoku puzzles but with five interlocking Sudoku grids. This book contains 100 of these massive puzzles, including solutions. All the Samurai Sudoku puzzles in this book are symmetric.

The rule is the same: Each row, column and 3x3 box in each puzzle grid must contain the numbers 1-9 only once. The puzzles start with a few easy ones for warming up, but the majority of the puzzles are hard and can take hours to solve.

This book is for those who feel ordinary Sudoku puzzles are too easy or too quick to solve and want more challenging puzzles. If you solve two of these every week this book will last you a year!

Have fun!

Killer Samurai Sudoku: 75 puzzles

By DJ APE CreateSpace Released: 2008-09-08 Paperback (90 pages)	List Price: $9.95 Lowest New Price: $9.95 Usually ships in 24 hours (As of 09:09 Pacific 12 Oct 2008 More Info) Click Here
Product Description: Volume 2 of the highly successful Killer Samurai book. This book contains 75 of the most challenging Sudoku variation puzzles - Killer Samurai, even including ZERO Killer Samurai. You get 25 easy, 25 medium and 25 hard puzzles.

The Way of Samurai: 101 Samurai Sudoku puzzles

By djape

Lulu.com
Paperback (124 pages)

List Price: $11.95
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Product Description:
A Sudoku puzzle variation called Samurai Sudoku consists of 5 overlapping Sudoku sub-puzzles.

In this book you get:

+ 80 Samurai Sudoku puzzles
+ 20 Samurai Sudoku "X" puzzles (diagonal-sudoku)
+ 1 BONUS Killer Samurai Sudoku puzzle

Difficulties range from EASY to INSANE.

These puzzles come from DJAPE, the creator of many sudoku variations which are being published in many books and magazines worldwide.

Killer Samurai Sudoku: 55 puzzles (vol.1)

By djape Lulu.com Paperback (72 pages)	List Price: $10.99 Lowest New Price: $9.21 Lowest Used Price: $8.53 Usually ships in 24 hours (As of 09:09 Pacific 12 Oct 2008 More Info) Click Here
Product Description: The most challenging Sudoku variation puzzles - KILLER Samurai. 55x5 killer sudoku puzzles, meaning that you get the equivalent of more than 250 puzzles! Guaranteed hours of fun while you solve these beasts.

Samurai Sudoku (Martial Arts Sudoku)

By Conceptis Puzzles

Sterling
Paperback (96 pages)

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This popular, even more challenging variant of sudoku is for true puzzle warriors! Each one consists of FIVE sudoku grids arranged in an X-shaped array, with overlapping corners. No grid can be solved on its own; to complete the entire puzzle, players have to work on several grids at once, making their way to overlapping areas and constantly searching for new clues.

While regular sudoku-solving techniques provide the starting point, the game’s more complicated than that. Because the overlapping areas belong to two different grids, they must comply with the rules of both simultaneously. That changes the puzzle’s underlying logic…and makes these sudokus more fun for the serious fan. An introduction, with a sample puzzle, shows all the strategies.