Contact puzzlemix
Play free puzzles         Create free account         Instructions         Discussion forum         Log in    

Brained Up, daily online brain training site
daily online brain training
Cutting-edge brain training created by Dr Gareth Moore
Think faster, better,
and improve your mental capabilities

Sudoku Xtra, written by Dr Gareth Moore
Sudoku Xtra 24
logic puzzle compendium
Printed puzzles from Dr Gareth Moore

Killer Sudoku

Jigsaw Sudoku
Consecutive Sudoku
Kropki Sudoku
Sudoku XV
Oddpair Sudoku
Toroidal Sudoku
Killer Sudoku-X
Killer Sudoku

Jigsaw Killer

Looking for puzzles for your book, magazine or newspaper?

How to play Sudoku X

Sudoku X builds on the rules of Sudoku. If you don't know how to play Sudoku then take a look first at the rules of Sudoku.

A Sudoku X puzzle adds to the standard rows, columns and bold-lined boxes by also requiring that you place 1 to 9 (or 1 to whatever the width of the puzzle is) into each of the two main diagonals, highlighted on puzzlemix in pink:

In this example puzzle you can use this new rule to immediately place the '1' in the centre box, as shown in the picture below. It can be eliminated from the centre square of the box because it is already in one of the diagonals.

When the puzzle is fully-solved you will have 1 to 9 in each row, column, 3-by-3 box and marked diagonal as shown here:

And that's all there is to Sudoku X!

Back to puzzle rules choice page

©Brained Up Ltd/Gareth Moore 2005-2021 - email - publishers please visit Any Puzzle Media - our privacy policy - registered in England & Wales no. 8642393