How to play
- Select an empty square and enter a number from 1 to 9.
- Check that the number does not repeat in its row.
- Check the same column and 3×3 box.
- Complete every empty square to finish the puzzle.
← All games
Logic
Sudoku
Complete a classic 9×9 Sudoku puzzle with instant mistake feedback.
3
7
2
6
1
9
5
1
8
2
7
5
6
2
6
8
7
1
1
2
5
1
7
4
4
9
5
5
8
7
Fill every row, column and 3×3 box with the numbers 1 to 9. Incorrect entries are highlighted.
About Sudoku
Sudoku is a number-placement logic puzzle. The goal is to fill the 9\u00d79 grid so each row, column and 3\u00d73 box contains every number from 1 to 9 exactly once. No arithmetic is required.
Tips and strategy
- Begin with rows, columns or boxes that already contain many numbers.
- Look for a number that has only one possible position.
- Use elimination rather than guessing.
- Review highlighted mistakes before continuing.
Why people play
- Develops logical deduction.
- Supports concentration and pattern recognition.
- Provides a calm, self-paced challenge.