Free Sudoku Online
Fill the 9×9 grid so each row, column, and 3×3 box contains the digits 1–9. This puzzle defaults to medium difficulty—you can switch levels below or jump to today’s daily challenge.
Time0:00
Difficulty
Mistakes: 0
How to play
Click or tap a cell, then enter a digit. Use Notes for pencil marks. On desktop, arrow keys move the selection; press N to toggle notes.
How to play sudoku and read a grid
What is Sudoku?
Sudoku is a logic puzzle on a 9×9 grid divided into nine 3×3 boxes. Each row, column, and box must contain the digits 1 through 9 exactly once. No arithmetic is required—only deduction.
How to play
- Scan for obvious singles—cells where only one digit fits.
- Use notes to track candidates when several digits might work.
- Check the row, column, and box together before committing a number.
- Reset restores the original puzzle; New puzzle shuffles a fresh grid.
Choose a difficulty
Easy puzzles include more clues; Expert puzzles remove more givens for a longer solve. Pick a level that matches your mood—or try the daily puzzle once and share your time.
Word tools
Need a break from numbers? Try the word unscrambler or anagram solver.
More Sudoku pages
Frequently asked questions
- Is sudoku a maths game?
- No. Sudoku only uses the digits 1 to 9 as symbols with no arithmetic involved. It is a deduction puzzle about placing each symbol exactly once in every row, column, and 3×3 box.
- Do I need an account to play sudoku here?
- No. Every sudoku grid on this site plays instantly in your browser with no signup, no download, and no saved profile. Notes stay on your device for the session.
- What is the difference between the difficulties?
- Easy grids can be solved with cross-hatching and singles. Medium introduces full candidate lists. Hard requires pairs and locked candidates, and expert adds box/line reduction and occasional X-wing patterns.
- How does the daily sudoku work?
- The daily sudoku is generated from the current UTC date, so every visitor sees the same grid until midnight UTC. It resets automatically and needs no account to play.