Sudoku Puzzle Solver

Reviewed & updated by Updated Originally published

Sudoku is a logic-based number-placement puzzle. In this game, the player uses reasoning to determine where each number belongs. The name “Sudoku” comes from a Japanese phrase meaning “the digits must remain single.”

How to play Sudoku?

Sudoku offers an engaging mental challenge as players work out where to place each number. The basic objective is to fill a 9 × 9 grid so that every row, column, and 3 × 3 box contains the numbers 1 to 9 without repetition.

The puzzle begins with some cells already filled in. These numbers serve as clues and cannot be changed. Players use them to determine the missing numbers.

What is interesting about playing Sudoku?

Sudoku does not require advanced mathematical knowledge or calculations. You only need to recognize the numbers and apply the rules using logic and reasoning.

Solving a Sudoku puzzle involves examining possibilities, recognizing patterns, and maintaining concentration. The challenge encourages players to work carefully and persist when a solution is not immediately obvious.

Sudoku puzzles are available on many websites and apps, as well as in newspapers and puzzle books.

Sudoku puzzle solver

Online Sudoku solvers use algorithms to find solutions based on the numbers provided. If you get stuck, a solver can help you check your entries or find a solution.

Some solvers also explain individual steps, which can help you understand solving techniques. Others simply display the completed grid.

How to use the Sudoku puzzle solver

Open the solver and enter the given numbers into the corresponding cells. Leave the remaining cells blank, then click “Solve.”

Check your entries carefully before submitting the puzzle. Incorrect or conflicting numbers may prevent the solver from finding a solution.

To practice your skills, try solving the puzzle yourself first. You can then use the solver to check your answer or, if explanations are available, learn how to approach a difficult step.

Online Sudoku Solver

Sudoku Puzzle Solver

Enter the given numbers, check your puzzle, and solve it instantly.

9 × 9 Sudoku
Puzzle editor

Fill in the known digits (1–9). Leave unknown cells blank. Click a cell to type or use the number pad.

Enter a puzzle or load the example to begin.
Original numbers Solved numbers
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SUDOKU PUZZLE

Solution & Answer Sheet

Complete the puzzle to see the solution.

Excel Solver

Sudoku Puzzle Solver for Excel

File: Excel (.xls) 2007+ and iPad
Size 135 KB