Sudoku
A straightforward 9×9 sudoku with notes and a check option, handy for spotting slips while you learn.
Controls
Select a cell with mouse or touch, tap a number from the pad, toggle notes, and use check to test your entries.
How to Play
Fill the 9×9 board so the digits 1 to 9 each appear once in every row, column and 3×3 box. The clues already on the grid are enough to solve it by logic alone, with no counting or arithmetic required.
If you would like the rules laid out plainly, our step-by-step guide covers everything a first-timer needs. Then use the notes to track possibilities and the check button to catch a wrong number early.
Tips & Tricks
- Pencil in candidates before writing a final answer to avoid painting yourself into a corner.
- Run a check now and then so a single mistake does not undo a lot of work.
- Look for a cell where only one digit can legally fit and lock it in.
Frequently Asked Questions
What does the check button do?
It reviews your entries, removes numbers that break the rules and keeps the correct ones, so you can move on without a hidden error building up.
Is it suitable for beginners?
Yes. The notes and check features make it forgiving, which is ideal while you are still getting comfortable with sudoku.
