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Play free classic Sudoku puzzles online with Easy, Medium, and Hard difficulties. Includes candidate notes, hints, undo, and conflict validation.
How to Play
Fill the 9x9 grid so every row, column, and 3x3 box contains digits 1 to 9 without repeating. Select a cell and tap numbers or use your keyboard.
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Sudoku is the world-renowned logic-based number placement puzzle. Fill the 9x9 grid so that every row, column, and 3x3 box contains digits 1 through 9.
Every row, column, and 3x3 block must contain the numbers 1 through 9 exactly once without duplicates or omissions.
Yes, all puzzles in ToolsHub Pro are mathematically validated with a single unique solution.
When Pencil mode is enabled, typing a number adds or removes small candidate notes inside the cell rather than setting the final value.
Verified community satisfaction score for Sudoku — Classic Number Logic Puzzle.