Sudoku Solutions: Sudoku Solver

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sudoku-solutions.com - Sudoku Tutor and Solver

Give your opinon on the new solver here.

The old version of the solver is on this site.

Features

Solving

Solve Cell

Solve Partially

Solve

Puzzle Analysis

Check

Rate Difficulty

Hint

Candidates

Generate

Remove

Edit Candidates

Puzzle

Load

Save

Seed

Clear

Undo

Samples ( 10415 sample puzzles available )

Simple

Easy

Medium

Hard

Sample Puzzle Number:

Select Puzzle

How to use

This solver offers a number of features to help you improve your solving skills and practice solving strategies. First enter the numbers of the puzzle in the grid or enter them via the "Load" button. You can then completely solve the puzzle or use the appropriate buttons to check the validity of the puzzle, get tips for step by step solving and more. For help on the features, click on the appropriate info icon.

Comments and suggestions to support@sudoku-solutions.com

Online Sudoku Solver.

Feedback / Comments

If you have a question you may find it already answered in one of the most frequently asked questions below:

No hints available

When a hint is requested, the solver uses a set of solving techniques to find the next step to solve the puzzle. For most puzzles a hint can be provided, however for some extremely difficult puzzles the solver will not be able to provide a hint and will return the message "No Hints Available".
This does not mean that the puzzle cannot be solved logically, it means that the limitations of the solver have been reached.

No solution

The solver returns this message when there is no solution for a puzzle. This can be due to an incorrectly specified cell value or an invalid candidate. Please recheck your input, clear your candidates and retry. If the solver still cannot solve the puzzle, then the puzzle is invalid.

Multiple solutions

Some puzzles have multiple solutions. Since puzzles with multiples solutions cannot be solved logically, they are technically invalid. It is a good idea to check if a puzzle has a unique solution using the "Check" function before starting to solve it.

If you have a comment or suggestion you can enter it below. Please add your email address to your comment if you would like a reply:

Solution Steps

Here you can view the logical steps used to solve the sudoku puzzle.
Click on a step to show its effects in the grid.
You can navigate through steps using the up and down arrows on the keyboard. More information >>

Multiple Solutions

For this puzzle 0 solutions were found. The solutions are listed below.

Click on the solution to view it in the grid. When you close this popup the original grid will be restored.

Save Puzzle

To save the puzzle please first enter an identification code of your choice in the field below.

Saved puzzles will be deleted after 60 days.

More Information >>

Identification Code

Comment (Optional)

Load Puzzle

To load a puzzle please first enter an identification code in the field below. The list of puzzles saved with that identification code will be displayed.

Identification Code:

Seed Puzzle

Paste the numbers into the input field below or enter them directly. Press the Fill Grid button to load the numbers into the grid.

Hint

There is no hint available.

The solver cannot give a hint because either :
- the candidates are incorrect
- the puzzle is too complex for the solver to solve logically

When providing hints, the solver works with the candidates entered on the grid. If they are incorrect, the solver will provide the wrong hints or no hints.

Please make sure that you either generate the candidates or provide all candidates before first requesting a hint.

Solving Features

Button: Solve Cell

Solves the cell of your choice. Click in the cell you want to solve first, then click this button

Button: Solve

Solves the puzzle completely

Button: Solve Partially

Solves the puzzle partially according to the preference settings. To set the preferences, click on the icon in the main menu at the top of the page.

Candidate Features

Button: Generate

Generate candidate values for all empty cells

Button: Remove

Removes all candidates from all cells

Checkbox: Edit Candidates

When checked candidates can be edited using the keyboard

You can edit candidates using the keyboard or the mouse.

Editing Candidates using the Keyboard

- Click the Edit Candidates checkbox first.

- Click in the cell you want to edit

- Type the candidate number to add it

- Type the candidate number again to remove it

- Type the DELETE Key to remove all candidates in a cell

Editing Candidates using the Mouse

- Click in an empty cell

- Click on the position of a candidate to add it

- Click on a candidate to remove it

Analysis Features

Button: Check

Checks if the puzzle is valid, can be solved and has a single solution

Button: Rate Difficulty

Display a difficulty rating for the remaining unsolved cells of the puzzle. Ratings are based on the techniques needed to solve the puzzle logically. Below is the list of ratings and associated solving techniques:

Rating

Solution Techniques

Simple

Naked Single, Hidden Single

Easy

Naked Pair, Hidden Pair, Pointing Pairs

Medium

Naked Triple, Naked Quad, Pointing Triples, Hidden Triple, Hidden Quad

Hard

XWing, Swordfish, Jellyfish, XYWing, XYZWing

Button: Hint

Request a hint to find the next cell to solve. A hint will either identify a cell which can be solved or a cell or cells where candidates can be removed. If candidates are entered on the grid, those candidates will be used to help provide a hint, otherwise the solver will generate the candidates in the background.
Please Note: If the candidates entered are wrong or incomplete, the solver will not be able to provide a correct hint.

Puzzle Features

Button: Load

Load a saved puzzle into the grid.

Button: Save

Save the puzzle currently displayed in the grid.

Button: Seed

Seed the grid from a pasted character string

Button: Print

Print the contents of the grid

Button: Clear

Reset the grid. Empties all cells and removes all candidates

Button: Undo

Revert changes one by one