Sudoku Generator and Solver

Generate Sudoku puzzles (easy, medium, hard) or solve any grid online — free Sudoku solver.

About

About the Sudoku Generator and Solver

Generates a fresh, always-solvable 9x9 Sudoku puzzle at easy, medium or hard difficulty, or solves a grid you type in yourself.

Puzzle fans use it to generate a fresh Sudoku whenever they want one, while anyone stuck on a puzzle from a book or app can type it in and get the full solution instantly. It's one of many free generators on Toolapt, and like every tool here, it's free to use with no sign-up and no limit on how many times you run it.

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Guide

Using the Sudoku Generator and Solver

  1. 1

    Step 1

    Choose a difficulty — Easy, Medium or Hard — and click "Generate puzzle" for a new grid.

  2. 2

    Step 2

    Fill in the empty cells yourself, typing digits 1-9 directly into each box.

  3. 3

    Step 3

    Click "Solve current grid" at any point to have the tool fill in the full solution.

  4. 4

    Step 4

    Click "Clear grid" to erase everything and start over.

  • Generates a fresh, guaranteed-solvable puzzle at Easy (35 clues removed), Medium (45) or Hard (55) difficulty
  • Every puzzle starts from a randomly generated complete valid solution, not a fixed template
  • Type numbers directly into any cell, with input limited to a single digit 1-9
  • "Solve current grid" runs a backtracking solver on whatever is currently in the grid, including your own entries
  • Given clues are shown in bold and locked so they can't be accidentally overwritten
  • Works entirely in your browser — no installs and no sign-up
  • Free to use, with no limit on how many times you run it
  • Fully responsive, so it works just as well on a phone as on a desktop

Puzzle fans

Puzzle fans use the Sudoku Generator and Solver for a fresh puzzle at their preferred difficulty whenever they want one.

Anyone stuck on a puzzle

Anyone stuck on a puzzle from a book or app uses the Sudoku Generator and Solver's solve feature by typing it in and getting the full solution instantly.

Teachers

Teachers use the Sudoku Generator and Solver for printing fresh logic puzzles for classroom activities.

Developers

Developers use the Sudoku Generator and Solver for a quick reference solver to test their own Sudoku logic against.

Examples

Sudoku Generator and Solver examples

3 worked examples

01

An Easy puzzle

An Easy puzzle removes 35 clues from the full 81-cell solution, leaving 46 given numbers; Solve current grid fills in the other 35.

02

A Medium puzzle

A Medium puzzle removes 45 clues from the full solution, leaving 36 given numbers.

03

A Hard puzzle

A Hard puzzle removes 55 clues from the full solution, leaving only 26 given numbers.

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FAQ

Frequently asked questions

Quick answers to common questions about the Sudoku Generator and Solver.

What does the Sudoku Generator and Solver do?

It generates a fresh, solvable Sudoku puzzle at your chosen difficulty, and can also solve any grid you type in yourself.

Is the Sudoku Generator and Solver free to use?

Yes. It's free, with no sign-up, no watermark and no limit on how many times you use it.

Is my input safe when I use this tool?

Yes. Every puzzle and solution is generated and solved entirely on your own device — nothing is sent to a server.

What do the difficulty levels change?

They control how many clues are removed from a complete solution before you start — Easy leaves the most clues (fewest removed), Hard leaves the fewest.

Can I solve a puzzle from a book or another app?

Yes. Type the given numbers into the matching cells on the grid, leave the rest blank, and click "Solve current grid".

What happens if I type in an unsolvable grid?

The tool tells you the grid has no solution rather than guessing — double-check the numbers you entered match the puzzle.

Can I use the Sudoku Generator and Solver on my phone?

Yes. The page is fully responsive and works on mobile, tablet and desktop browsers alike.

Does the Sudoku Generator and Solver have any limitations?

It only supports the standard 9x9 Sudoku grid with three difficulty presets — it doesn't support other grid sizes or custom variants.

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