Sudoku X Puzzle Book

Welcome to this exciting selection of Sudoku X puzzles. The book contains 100 brand new 9x9 sudoku X puzzles. The rules are simple:

- Place the numbers 1 - 9 once in each row, column and 3x3 box in the grid.

- In addition, the two major diagonals of the puzzle (marked in grey) must also contain the numbers from 1 - 9 exactly once.

That's it! Armed with just those rules, you must place numbers in all the empty cells in the grid to solve the puzzle.

If you would like to try a few of the puzzles before buying this book, please click the link below:

Sudoku X Sample

The book is available to purchase from Amazon.co.uk, Amazon.com and Amazon.eu. Please click the relevant link below to purchase this book via Amazon:

Sudoku X Solving Strategies

Here is a video explaining the rules of Sudoku X:

But what rules are required to solve the puzzle? Well, that's the joy of sudoku X - unlike some other sudoku variants that have some very complicated rules, all you do with sudoku X is to apply the standard rules, but to the two major diagonals too that form the 'X' region. The key to success in sudoku X is to use these grey regions to solve the puzzle: most people get stuck when solving by forgetting to make deductions along the X's that are surprisingly powerful in aiding solving: indeed this can be seen by the fact that sudoku X contain less givens in many cases than standard sudoku puzzles.

If you would like to try a sample before deciding whether to buy, then please do print off the sample puzzles linked to above: we've put six on this site free of charge so that you have a good idea of what the puzzles are like and how difficult they are. We hope you'll agree that they make a fun change from standard sudoku without being too different to the standard puzzle to lose that unique sudoku charm.

If you have any solving tips or comments on sudoku X or indeed any other puzzle, then we would love to hear your thoughts, so please do get in touch with us!