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Solve any Sudoku puzzles, even the world's hardest ones.
Although this Sudoku solver is free to use, it is powerful enough to solve all valid Sudoku puzzles.
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A valid Sudoku puzzle has one and only one solution. If your puzzle has no solution or more than one solution, your puzzle is not valid. However our solver will still provide a solution even if your puzzle has more than one solution.
Use mouse to select (click on) a digit on the right side bar first and then click on the square where you want to place the digit in the grid. To switch to keyboard (the default mode), simply press the keyboard button. When finished, press 'Solve'.