Sudoku Online
Sudoku Online offers the classic 9×9 grid at four difficulty levels, plus variants including X-Sudoku, Killer Sudoku and Kropki. Solve each puzzle by logic, keep notes for possible digits and track your progress.
How to play & controls
Fill the grid with digits 1 to 9 without repeating a digit in any row, column or 3×3 box. Start with cells that have fewer possibilities and use notes on harder puzzles.
About the game
Sudoku Online offers the classic 9×9 grid at four difficulty levels, plus variants including X-Sudoku, Killer Sudoku and Kropki. Solve each puzzle by logic, keep notes for possible digits and track your progress.
PuzzlesHow to play
Fill the grid with digits 1 to 9 without repeating a digit in any row, column or 3×3 box. Start with cells that have fewer possibilities and use notes on harder puzzles.
- Free
- In your browser
- Mobile and desktop
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