How do I solve this Sudoku puzzle?

Type the known digits into the 9x9 grid, leave unknown cells blank, and click Solve. The tool fills the remaining cells using Sudoku rules.

Can this Sudoku solver detect invalid puzzles?

Yes. If your entries break Sudoku rules with duplicates in a row, column, or 3x3 box, the page shows an error before solving.

Why does my Sudoku have no solution?

Most unsolvable puzzles contain a mistaken clue or conflicting entries. Re-check the given numbers and remove any conflicting values.

Can I use this for hard or expert Sudoku?

Yes. The solver works for easy, medium, hard, expert, and other valid classic Sudoku puzzles as long as the input follows standard 9x9 rules.

Can I see step-by-step Sudoku explanations?

Yes. Use Explain Next Step to apply one logical move at a time, or Show All Steps to generate a sequence of explainable moves.

Is this Sudoku solver free?

Yes. You can use the Sudoku solver online for free on Sudoku Unlimited with no signup required.

Can I solve Sudoku puzzles from newspapers or apps?

Yes. Copy the visible clues from your newspaper, book, or app into the grid, then click Solve to get the completed puzzle.

Sudoku Solver - Solve This Sudoku Puzzle Online

How to Solve This Sudoku Quickly

If you are stuck and searching for how to solve this Sudoku, enter your known digits into the grid above and press Solve. The solver applies standard Sudoku rules (rows, columns, and 3x3 boxes) and fills the board in seconds.

Want to learn instead of jumping to the final answer? Use Explain Next Step for guided logic or Show All Steps to view a full sequence of explainable moves.

How to Enter Your Puzzle

Copy only the given numbers from your puzzle.
Leave unknown cells empty.
Use one digit (1-9) per cell.
Click Solve to get the completed grid.

Why Your Sudoku Might Not Solve

If the solver reports an invalid or unsolvable puzzle, there is usually a typo in the input clues. Re-check repeated digits in each row, column, and 3x3 box, then try again.

Practice on New Puzzles

After checking your answer, practice with playable boards on our classic Sudoku page or try a variant on Killer Sudoku.

Sudoku Solver FAQ

How do I solve this Sudoku puzzle?: Type the known digits into the 9x9 grid, leave unknown cells blank, and click Solve. The tool fills the remaining cells using Sudoku rules.
Can this Sudoku solver detect invalid puzzles?: Yes. If your entries break Sudoku rules with duplicates in a row, column, or 3x3 box, the page shows an error before solving.
Why does my Sudoku have no solution?: Most unsolvable puzzles contain a mistaken clue or conflicting entries. Re-check the given numbers and remove any conflicting values.
Can I use this for hard or expert Sudoku?: Yes. The solver works for easy, medium, hard, expert, and other valid classic Sudoku puzzles as long as the input follows standard 9x9 rules.
Can I see step-by-step Sudoku explanations?: Yes. Use Explain Next Step to apply one logical move at a time, or Show All Steps to generate a sequence of explainable moves.
Is this Sudoku solver free?: Yes. You can use the Sudoku solver online for free on Sudoku Unlimited with no signup required.
Can I solve Sudoku puzzles from newspapers or apps?: Yes. Copy the visible clues from your newspaper, book, or app into the grid, then click Solve to get the completed puzzle.