Sudoku X Generator
Diagonal sudoku: the usual rules, plus both diagonals must hold 1–9. Pick a difficulty and play, print, or download. Every puzzle is guaranteed to have exactly one solution.
Standard sudoku rules, plus both shaded diagonals must also contain 1–9 with no repeats.
Click a cell, then type a number (or use the pad).
Explore the The Sudoku Family & Grid Variations
Explore the full range of Sudoku variations — from classic 9×9 grids to diagonal constraints, cage sums, irregular polyominoes, and word-based puzzles.
Sudoku X
Diagonal constraints — both X diagonals must contain 1–9
Learn How to Play, Solve & Teach Sudoku X Generator
What Is Sudoku X? Diagonal Sudoku Explained
Sudoku X adds two diagonal constraints to classic sudoku, making every clue count for more. Learn the rules, why the diagonals change how you solve, and generate free printable Sudoku X puzzles with a unique solution.
How to Solve Sudoku: A Beginner's Guide (No Math Required)
New to sudoku? Learn the one rule, the simple scanning techniques, and a step-by-step method to solve any beginner puzzle — no math needed. Play free online or print a puzzle with its answer key.
Frequently asked questions
What is Sudoku X?+
Sudoku X — also called diagonal sudoku — follows all the normal sudoku rules (1–9 once per row, column and 3×3 box) with one extra rule: the two main diagonals must each also contain 1–9 with no repeats.
Is the Sudoku X generator free?+
Yes. Generate unlimited diagonal sudoku puzzles and play, print or download them for free — no account or signup needed.
Does every puzzle have one solution?+
Yes. We remove clues only while a solver confirms the puzzle still has exactly one unique solution, so every Sudoku X is solvable by logic alone.
How is it different from regular sudoku?+
The two shaded diagonals add extra constraints, which often gives you more starting deductions — a fresh twist that experienced sudoku solvers enjoy.
How do I print a Sudoku X?+
Click Preview & Download, choose US Letter or A4, and download the PDF. It includes the puzzle with the diagonals shaded plus a separate answer key page.