Sudoku
Fill the 9×9 grid — every row, column and box 1–9.
Runs entirely in your browser — no signup, and your scores stay on your device.
About this game
Sudoku is a logic puzzle: a 9×9 grid partly filled with digits. Complete it so that every row, every column, and each of the nine 3×3 boxes contains 1 through 9 with no repeats. Puzzles here are generated in your browser from a fully solved grid, then dug out to a chosen difficulty while guaranteeing exactly one solution — so every puzzle is fair and solvable by logic alone.
Example
If a row already contains 1–8, the empty cell must be 9. 'Cross-hatching' finds more: scan a 3×3 box plus the rows and columns crossing it to see the only square a given digit can legally go. Use notes to pencil in candidates when a cell has two or three possibilities.
How to play
- 1Pick a difficulty — Easy, Medium, or Hard.
- 2Select a cell, then type a digit 1–9 (or tap the number pad).
- 3Use notes to pencil in candidates when a cell isn't certain.
- 4Fill every cell correctly to complete the puzzle.
Controls
- Click / TapSelect a cell
- 1–9Enter a digit
- Backspace / 0Clear a cell
- Arrow keysMove the selection
Features
- Three difficulty levels with a guaranteed unique solution.
- Pencil-mark notes for candidate digits.
- Instant conflict highlighting so mistakes are easy to spot.
- Built-in timer and a fresh puzzle every game.
Frequently asked questions
Does every puzzle have a unique solution?
Yes. Each puzzle is generated from a completed grid and only clues that keep the solution unique are removed, so it can always be solved by logic without guessing.
What do the difficulty levels change?
Higher difficulties leave fewer starting clues, which forces more advanced solving techniques.
More puzzle games
View allDaily Word
A word-guessing game: everyone gets the same secret 5-letter word each day. Green means right letter and spot, yellow means right letter wrong spot. Keep a streak and share your result as a spoiler-free emoji grid.
Play now2048
Swipe or use arrow keys to slide numbered tiles; when two of the same number touch they merge into their sum. Keep going to reach the 2048 tile — and beyond.
Play nowMemory Match
A concentration game: flip cards two at a time to find matching pairs. Match them all in as few moves as possible. Choose your grid size for a quick game or a real challenge.
Play now