Numbers · 9×9 Sudoku
Sudoku
Classic 9×9 Sudoku with notes and automatic candidate clean-up.
About Sudoku
Classic 9×9 Sudoku with symmetric clues and a unique solution. Fill every row, column and 3×3 box with 1–9. Notes are cleared automatically when you place a digit, so you can focus on the deductions.
Play a new daily puzzle every day, or pick Easy, Medium or Hard in practice mode for unlimited puzzles.
How to play
- Fill the empty cells with 1–9.
- Each row and column contains 1–9 exactly once.
- Each bold 3×3 box also contains 1–9 exactly once.
Every puzzle has a unique solution with symmetric clues: about 38 on Easy, 30 on Medium, minimal on Hard.
Select a cell and tap a number. Notes are cleared automatically from the row, column and box when you place a digit.
Tips & strategies
- Start with naked singles: cells with only one possible digit.
- Look for hidden singles — a digit with only one place in a row, column or box.
- Pairs and pointing pairs remove candidates elsewhere.
FAQ
How do you play Sudoku?
Fill the empty cells with 1–9. Each row and column contains 1–9 exactly once. Each bold 3×3 box also contains 1–9 exactly once.
Is there a new Sudoku puzzle every day?
Yes. A new daily puzzle arrives at midnight (your local time) and everyone gets the same one. Missed days can be played from the archive.
Do I need to sign up or install anything?
No. Daily Brain runs in your browser. You can add it to your home screen and it keeps working offline after the first visit. Progress is stored only on your device.
Are there difficulty levels and hints?
Practice mode offers Easy, Medium and Hard with unlimited new puzzles. Hints are available when you get stuck and are recorded in your result.