Free Sudoku X Maker
Free Sudoku X Generator
Two extra regions: both main diagonals must hold 1 to 9
Updated Oct 31, 2026
Sudoku X adds two constraints to a normal 9×9 grid: each of the two main diagonals must also contain the digits 1 to 9 exactly once. Those seventeen cells belong to a row, a column, a box and now a diagonal, which makes them the most constrained squares on the board and usually the best place to start. The extra rule means fewer given digits are needed, so a sudoku X grid can look sparser than a plain sudoku of the same difficulty and still solve cleanly by logic.
Why use Puzzone
Diagonals as Extra Clues
The two marked diagonals are shaded in the PDF so the extra regions are obvious at a glance while solving.
Three Difficulties
Easy, medium and hard, each verified to resolve with the diagonal rule in play.
One Solution, Guaranteed
Every puzzle is checked against the full rule set — rows, columns, boxes and both diagonals — for a single valid grid.
Free and Unlimited
No account and no cap on how many you generate. Free puzzles are for personal and classroom use; commercial use comes with Premium.
How it works
Choose Difficulty
Pick easy, medium or hard depending on who is solving.
Get Your Puzzle
A fresh sudoku X with both diagonals constrained is ready at once and remade when you change the difficulty; New puzzle makes another.
Print or Export
Download the print-ready PDF with the answer key, or click New puzzle for a different grid.
Frequently asked questions
A sudoku variant, also called diagonal sudoku, where the two main diagonals each have to contain 1 to 9 exactly once in addition to the usual row, column and 3×3 box rules.