Play Free Sudoku Online
Start instantly with easy Sudoku on the homepage, then move to medium, hard, expert, or daily puzzles as your solving confidence grows.
Why Play Sudoku on freeSudoku.io
freeSudoku.io is built for clean, distraction-light Sudoku sessions. You can start immediately, switch difficulty fast, and use notes, hints, and undo without breaking your solving flow.
Choose Your Difficulty Level
Use easy mode to build confidence, medium for balanced daily practice, and hard or expert when you want deeper elimination chains and longer logical solving paths.
Build Skills with Daily Practice
Daily Sudoku gives you one fresh puzzle each day, while classic levels let you target specific weak spots. If you want to improve faster, combine regular practice with Learn articles and technique drills.
Frequently Asked Questions
Everything you need to enjoy Sudoku with calm, focused play.
How do I play Sudoku online?+
Fill each row, column, and 3×3 box with digits 1 to 9 exactly once. Tap or click a cell, then choose a number from the keypad.
Is an account required to play Sudoku?+
No. You can start immediately in your browser without creating an account.
Can I play Sudoku for free?+
Yes. All core Sudoku modes on freesudoku.io are available for free.
Can I play Sudoku without downloading anything?+
Yes. The game runs directly in your browser on desktop and mobile devices.
Is there a mobile version of Sudoku available?+
Yes. The grid and controls are responsive and optimized for touch screens.