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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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Game guide

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

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

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