Sudoku
Choose from 45 starter Sudoku boards across Easy, Medium, Hard, Expert and Extreme. Keyboard and on-screen number entry both work.
How to play Sudoku
Fill the 9×9 grid so every row, column and 3×3 box contains the numbers 1 to 9 exactly once. Click a square and type a number on your keyboard, or use the on-screen number pad on mobile.
Use Easy boards to warm up, Medium boards to practise scanning, Hard boards for candidate elimination, and Expert or Extreme boards when you want a slower logic challenge.
Sudoku strategy tips
- Start with rows, columns or boxes that already contain the most numbers.
- Look for singles: cells where only one number can fit.
- Use cross-checking before guessing; a valid Sudoku should have a logical path.
- When stuck, pause and scan each missing number from 1 through 9.
Sudoku difficulty guide
| Level | Best for | What changes |
|---|---|---|
| Easy | Beginners and daily warm-ups | More givens and simple row/column scans. |
| Medium | Regular players | More box logic and fewer obvious singles. |
| Hard | Focused solving sessions | Requires candidate tracking and multi-step elimination. |
| Expert | Experienced players | Fewer givens and more hidden singles/pairs. |
| Extreme | High-difficulty practice | Designed to take patience and careful checking. |
Sudoku FAQ
Can I play with the keyboard?
Yes. Select a square and press 1–9. Backspace, Delete or 0 clears an editable square. Arrow keys move around the grid.
Should I use hints?
Hints are useful when learning, but harder puzzles are more rewarding if you use them only after checking every row, column and box.
Are the boards timed?
The current board can be played at your own pace. The site focuses on steady solving, local progress and difficulty variety rather than pressure.
What makes Extreme different?
Extreme boards are intended to require slower scanning and more candidate thinking. They are still meant to be fair and solvable.