'X'mas Sudoku

To solve sudoku X puzzles, you should proceed using the familiar rules from sudoku, but remember to apply the rules to the two grey diagonals also.

All puzzles feature solutions towards the back of the book and there's even a bonus Christmas quiz to enjoy. Good luck, happy solving & Merry Christmas! Please do let us know how you get on with this unique puzzle. Good luck and happy solving!

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

'X'mas Sudoku Sample

The book of 'X'mas Sudoku is available to purchase right now from Amazon.co.uk, Amazon.com and Amazon.eu. Please click the relevant link below to purchase this book via Amazon:

New to sudoku? Be sure to follow the following tips and once you've mastered the basics, you will be a Sudoku 'X' pro in no time!

- Remember the basic rules: if only one number is a candidate for a square, it can be written in

- If there is only one square in a region that a number can be placed, it must be placed there, regardless of how many numbers left you have as candidates for that square

- Look at squares that are shared by more than one region: if those squares must contain a number then they can be removed from all the other squares in the two regions that share them (this is known as region intersection)

- Look at sets of squares that must contain numbers: for instance if three squares in a region have as candidates 15,125,25 then the numbers 1, 2 and 5 can be removed as candidates from all other squares in the region because you know that these three squares must contain the 1, 2, and 5 in some combination or other.