Sudoku
Fill the grid so every row, column and box contains the digits one to nine exactly once.
Sudoku
Fill the grid so every row, column and box contains the digits one to nine exactly once.
Starts in your browser. Instructions are below.
Controls
- Keyboard and mouse
- Click a square, then click a number on the keypad to fill it in.
- Touch
- Tap a square, then tap a number on the keypad.
Scoring and how to win
- Fill the grid so every row, every column and every 3 by 3 box contains 1 to 9 exactly once.
- Easy removes 38 numbers, Medium 46 and Hard 54, so harder puzzles start with fewer clues.
- The puzzle is solved when every square matches the solution. Use the Check button to see how you are doing.
How to play Sudoku
- 01Pick a difficulty: easy, medium or hard.
- 02Click an empty cell, then click a number on the keypad below the grid to fill it in.
- 03Click Check at any time to highlight cells that do not match the solution.
About Sudoku
Sudoku fills a nine-by-nine grid so that every row, column and three-by-three box contains the digits one to nine exactly once. Each puzzle here is generated from a complete solved grid with some cells removed, so it always has exactly one valid solution.
Pick easy, medium or hard, select a cell, then tap a number on the keypad to fill it in. Tap the X option on the keypad to clear a cell you want to change.
Use the Check button whenever you want to confirm your progress. It marks any filled cell that does not match the solution so you know exactly where to look again.
Frequently asked questions
- Does every Sudoku puzzle have only one solution?
- Yes. Each puzzle is generated from a complete solved grid with cells removed, so it always has exactly one valid solution.
- Can I use pencil marks or notes?
- No. This version only lets you enter a final digit in each open cell, so keep track of candidates in your head or on paper.
- How do I know if I made a mistake?
- Click Check. It highlights any filled cell that does not match the solution so you can fix it.
- What is the difference between easy, medium and hard?
- Harder puzzles start with fewer filled cells, which gives you less information up front and requires more logical steps to finish.
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