Easy Sudoku X
Free printable easy Sudoku X (diagonal sudoku) with plenty of clues. Normal sudoku rules plus both diagonals must hold 1–9. Every puzzle has one unique solution. Play online, print, or download the PDF with the answer key.
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).
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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 Easy Sudoku X
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.