Sudoku Online — Free Sudoku Puzzles
Play unlimited Sudoku online for free. Thousands of hand-graded Sudoku puzzles from easy to evil — sometimes spelled sodoku or soduku — with a clean, distraction-free board that works on any device.
Why play Sudoku online at SodokuDX
Unlimited free puzzles
Fresh Sudoku puzzles generated on demand — never run out, never pay.
Easy to evil difficulty
Six difficulty tiers, from your first Sudoku puzzle to expert-only evil grids.
No signup, no ads in the way
Open the page and start solving. Progress saves automatically in your browser.
Works on any device
A responsive Sudoku board tuned for phone, tablet, and desktop play.
What is Sudoku?
Sudoku is a logic puzzle played on a 9×9 grid divided into nine 3×3 boxes. The goal is simple: fill every row, every column, and every box with the digits 1 through 9, with no repeats. A well-formed Sudoku puzzle has exactly one solution and can be solved by pure logic — no guessing required.
Sodoku or Soduku? It's the same game
You'll often see the puzzle typed as sodoku or soduku. Both are common misspellings of Sudoku — the Japanese-named number placement puzzle that took the world's newspapers by storm. Whichever spelling brought you here, SodokuDX has the puzzles you're looking for.
Sudoku puzzles for every level
Beginners can warm up on Easy and Medium boards with plenty of starting digits and clear scanning opportunities. Intermediate solvers get Hard puzzles that require naked pairs, pointing pairs, and box-line reduction. Experts can tackle Evil Sudoku puzzles that demand X-Wings, Swordfish, and forcing chains — the same techniques covered in our advanced strategies guide.
Frequently asked questions
Is SodokuDX really free?
Yes. Every Sudoku puzzle on SodokuDX is free to play online with no account required.
What's the difference between Sudoku, sodoku, and soduku?
None — sodoku and soduku are just misspellings of Sudoku. It's the same 9×9 number puzzle either way.
Can I play Sudoku offline?
SodokuDX runs in your browser, and once loaded, in-progress puzzles keep working even if your connection drops.
Do you have Killer Sudoku?
Yes — see our Killer Sudoku guide for the rules and strategies.
Ready to play Sudoku online?
Jump straight into a fresh puzzle at your favorite difficulty.
Start a Sudoku puzzle