Is this Sudoku free to play?

Yes. Sudoku is free on PLAYNESKO, with no download and no sign-up.

Do I need to be good at maths to play Sudoku?

No. Sudoku is a pure logic puzzle — the digits are just symbols. You never have to add or calculate anything, only deduce where each number goes.

How do I enter numbers?

Click a cell to select it, then type a number from 1 to 9 on your keyboard or tap the on-screen keys.

Does every Sudoku have one solution?

Yes. A well-formed Sudoku has exactly one solution that can be reached by logic alone, with no guessing.

Do I need to install anything?

No. Sudoku runs in your web browser with nothing to download.

Puzzle · Live

SUDOKU

Fill the grid so every row, column, and 3×3 box holds the digits 1 through 9. Use notes to track your logic — three mistakes and the grid wins.

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LEADERBOARD

Top 10 · Global

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About Sudoku

Sudoku is the world's most popular logic puzzle: a 9×9 grid that you fill so every row, every column, and every 3×3 box contains the digits 1 to 9 exactly once. PLAYNESKO's neon Sudoku gives you a clean, free board to solve right in your browser.

There's no maths and no guessing required — only deduction. Every puzzle has a single solution that you can reach purely by reasoning about which numbers can and can't go where.

PuzzleControls: Mouse / KeysNumbersLogic

How to Play Sudoku

1Click a cell to select it, then type a number from 1 to 9, or use the on-screen keys.
2Fill the grid so each row contains the digits 1 through 9 with no repeats.
3Do the same for every column and for each of the nine 3×3 boxes.
4Use the starting clues as anchors and work outward from the most-filled rows, columns, and boxes.

Tips & Strategy

Scan for 'naked singles' — cells where only one digit can legally fit.
Look for 'hidden singles' — a digit that can go in only one cell within a row, column, or box.
Track candidates for tricky cells instead of guessing; Sudoku always has a logical next step.
When stuck, switch focus from cells to digits: ask 'where can the 7s go?' across the whole grid.

Frequently Asked Questions

Is this Sudoku free to play?: Yes. Sudoku is free on PLAYNESKO, with no download and no sign-up.
Do I need to be good at maths to play Sudoku?: No. Sudoku is a pure logic puzzle — the digits are just symbols. You never have to add or calculate anything, only deduce where each number goes.
How do I enter numbers?: Click a cell to select it, then type a number from 1 to 9 on your keyboard or tap the on-screen keys.
Does every Sudoku have one solution?: Yes. A well-formed Sudoku has exactly one solution that can be reached by logic alone, with no guessing.
Do I need to install anything?: No. Sudoku runs in your web browser with nothing to download.

Embed Sudoku on your site

Sudoku is free to embed on any website, blog, or classroom page — no permission needed. Paste this code where you want the game to appear.

Embed code

<iframe src="https://playnesko.com/embed/sudoku" width="100%" height="640" style="border:0;max-width:100%" title="Sudoku — free online game" allowfullscreen loading="lazy"></iframe>
<p>Play <a href="https://playnesko.com/games/sudoku">Sudoku</a> free on <a href="https://playnesko.com">PLAYNESKO</a></p>

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