This is a variation on classic Sudoku where each shaded diagonal must also contain 1 though 9 exactly once. The extra information provided by this additional constraint allows Sudoku-X puzzles to have fewer givens to start. Experienced sudoku solvers find this variation fun and refreshing.

Our puzzles are carefully graded by difficulty: Easy, Moderate, Hard and Challenging. (We can also generate Extra Easy puzzles that are suitable for younger solvers.) All puzzles are rigorously tested to ensure that they have exactly one solution, which can be deduced by logic alone (no guessing is required.)

We provide puzzles and solutions in print-ready format (EPS, or Encapsulated Post-Script) as well as machine-readable format (XML), and can provide custom content and format as required.

Other varieties of Sudoku: (Click link for more details.)

Classic Sudoku: The original puzzle that started the world-wide phenomenon.

Sudoku-6: A 6x6 puzzle that is fast and fun to solve!

Please feel free to download our samples or contact us with your requirements.

You can find our puzzles at uClick.com and in Edigrama publications.

Click here to download a zip file with:

• A PDF document, ready to print, that contains several Sudoku-X puzzles of various difficulty levels, with solving instructions, and solutions
• Encapsulated Post-Script (EPS) files for these puzzles
.