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 on the Easy through Hard levels — every puzzle here has one unique solution.
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.
Six levels, from Easy to Extreme
Our difficulty levels are graded by the solving techniques a puzzle requires, not merely by how many numbers are given:
- Easy — solvable by spotting single candidates. A relaxed break.
- Medium — a little more scanning and light note-taking.
- Hard — rewards pencil marks and pattern-spotting across the grid.
- Expert — demands advanced reasoning and careful bookkeeping.
- Master — sparser boards that need deep, deliberate solving.
- Extreme — near-minimal grids for solvers who want the ultimate test.
Tips to solve faster
- Use pencil marks (the Notes button) to jot every candidate, then eliminate them as you go.
- Scan one number at a time across the whole grid to see 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.
Why play Sudoku?
Sudoku is a calm, screen-friendly way to sharpen focus and pattern recognition. There are no accounts and no downloads — just a clean board that loads instantly and works offline. Play a quick Easy round on a break, or settle in with an Extreme grid when you want to think.