Play Sudoku
How to play Sudoku
Sudoku is a logic puzzle played on a 9×9 grid divided into nine 3×3 boxes. The goal is simple: fill every empty square so that each row, each column, and each 3×3 box contains the numbers 1 through 9 exactly once. No guessing is ever required — every puzzle here has one unique solution you can reach with logic alone.
Start by scanning for squares that can only hold one number, because the other eight already appear somewhere in the same row, column, or box. Each number you place rules out more options elsewhere, so the grid steadily unlocks itself.
Easy, Medium, Hard, and Expert
Our difficulty levels are graded by the solving techniques a puzzle requires, not just by how many numbers are given:
- Easy — solvable by spotting single candidates. Great for a relaxed break.
- Medium — needs a little more scanning and light note-taking.
- Hard — rewards pencil marks and pattern-spotting across the grid.
- Expert — for seasoned solvers who enjoy a long, deliberate challenge.
Tips to solve faster
- Use pencil marks (the Notes button) to jot every candidate in a square, then eliminate them as you go.
- Scan one number at a time across the whole grid to find where it can and can’t fit.
- Watch the 3×3 boxes as closely as the rows and columns — they often reveal the next move.
- Stuck? The Hint button explains the next logical step so you learn the technique, not just the answer.
Why play Sudoku?
Sudoku is a calm, screen-friendly way to sharpen focus and pattern recognition. There are no accounts, no downloads, and no timers forcing you to rush — just a clean board that loads instantly and works offline. Play a quick Easy round on a break, or settle in with an Expert grid when you want to think.