9 by 9 Sudoku Solver

Visit our new Sudoku Forum.

Allowed values : 1,2,3,4,5,6,7,8,9

The box below offers an alternative way of filling the board faster. Seed the board with the sample numbers or enter your own numbers.

This Sudoku solver will help you solve any valid SuDoku in seconds. Just seed the SuDoku board with numbers and then click on the appropriate button to check, partially solve or completely solve the puzzle. For a complete description of the features scroll down the screen.

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Feedback

If you have any questions, comments or suggestions regarding this solver, please make a post in the appropriate section of our new Sudoku Forum. You can post anonymously if you wish or alternatively you can register yourself as a user and then post under your new username.

How to use

This is what the buttons do :

HINT button: Get a hint.
SHOW CANDIDATES button: Display candidate values for empty cells.
HIDE CANDIDATES button: Hides candidate values in empty cells.
SOLVE button: Solves the Sudoku completely.
SOLVE CELL button: Solves the Sudoku for a single cell. Click in the cell you want to solve first.
CHECK button: Checks if the Sudoku is valid and can be solved.
CHECK UNIQUE SOLUTION button: Checks if the Sudoku has a unique solution.
RATE DIFFICULTY button: Displays a difficulty rating of the Sudoku
PRINT button: Opens a new window from which the Sudoku can be printed
CLEAR button: Clears the puzzle.
SAVE button: Generates a file containing the current values in the Sudoku grid for downloading.
SEED button: Allows the board to be filled quickly form the seed box.