---
title: "What is the best free sudoku generator? | Once Books"
description: "The best free sudoku generator makes a printable board and its solution in a click, with no sign-up, and guarantees exactly one solution. Our free…"
source: "https://www.oncebooks.com/answers/best-free-sudoku-generator"
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3. What is the best free sudoku generator?

Answer

# What is the best free sudoku generator?

Updated 15 September 2026

The best free sudoku generator makes a printable board and its solution in a click, with no sign-up, and guarantees exactly one solution. Our free generator does that at every difficulty, using the same engine as our KDP studio.

A free generator is perfect for a single puzzle for home or the classroom. Pick a difficulty, press generate, and print two pages: the board and its solution. Try the [free sudoku generator](https://www.oncebooks.com/tools/sudoku-generator).

To make a book you can sell, you need hundreds of graded puzzles, the right [KDP trim size](https://www.oncebooks.com/glossary#kdp-trim-size) and a [print-ready](https://www.oncebooks.com/glossary#print-ready) file. That is the job of [Publisher Studio](https://www.oncebooks.com/kdp-sudoku-maker).

Try it free

[Sudoku generator Pick a difficulty and print a sudoku plus its solution. No watermark. Try it free](https://www.oncebooks.com/tools/sudoku-generator)

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