How to use this tool
- Choose easy, medium, or hard and enter a memorable seed.
- Select up to four puzzles and regenerate when you want a different deterministic version.
- Turn on answer keys before exporting the worksheet.
Educational Tools
Sudoku Generator
Generate seeded easy, medium, or hard Sudoku puzzles with unique solutions and answer keys. Everything stays editable until you choose to download or print.
Live preview
1 unique-solution medium puzzle
Practical uses
- Logic warm-ups
- Classroom activity packs
- Travel and screen-free puzzle sheets
Limitations and privacy
Difficulty is estimated by clue count rather than a human-solving-technique rating, so perceived challenge varies.
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Frequently asked questions
Does every puzzle have one solution?
Yes. Each removed clue is accepted only while a solution counter confirms exactly one solution.
What is a seed?
A seed is text used to reproduce the same generated puzzle with the same settings.
Can answers be printed separately?
Answer keys appear after their puzzle in the exported layout when enabled.