Sudoku
Fill the grid so every row, column and box holds each number once. Fill the grid so every row, column and box holds each number once — from a gentle 4×4 warm-up to the classic 9×9, with endless puzzles, notes and hints.
How to play Sudoku
Learn it in seconds. Here's the whole game in four steps.
Pick a cell
Tap an empty square, then choose a number from the pad below the grid.
One of each
Every row, every column and every box must contain each number exactly once.
Use notes
Not sure yet? Switch to notes and pencil in the candidates for a cell.
Take a hint
Stuck? A hint drops a correct number into the grid to get you moving again.
Why players love Sudoku
Simple to pick up, easy to love.
Three difficulties
Ease in with 4×4, step up to 6×6, or take on the classic 9×9 grid.
Unlimited puzzles
A fresh, uniquely-solvable board every time — never the same puzzle twice.
Auto-saved boards
Leave mid-puzzle and come back — your grid resumes exactly where you left off.
Hints when stuck
A gentle nudge places a correct number so you never hit a dead end.
Pencil-mark notes
Jot candidate numbers into cells, just like on paper.
Free & no sign-up
Play instantly in any browser on phone, tablet or desktop.
Ready to play Sudoku?
No download, no sign-up — jump straight in and play free in your browser on any device.
Play Sudoku