Sudoku with answer keys

Printable Sudoku

Printable sudoku PDFs in easy, medium, hard and expert difficulty levels, each with a verified answer key.

24 printable sheets Letter + A4 PDF Answer keys where needed

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Printable sudoku exercises logical deduction and working memory by requiring solvers to place the digits 1–9 in every row, column and 3×3 box without repetition. Easy sudoku provides more pre-filled cells and leans on simple elimination, making it a practical activity for students learning the rules. Medium puzzles introduce more blank cells and light deductive chains. Hard and expert grids offer minimal starting clues and demand advanced techniques such as naked pairs, hidden triples and X-Wing patterns — a genuine challenge for experienced solvers.

Every sudoku in this library is algorithmically verified to have exactly one unique solution, so solvers can be confident there is no ambiguity. The matched answer key is a separate page download, keeping solutions private until you are ready to share them. All sheets print in Letter and A4 format. Use the difficulty filter to find the right level, or browse all 24 puzzles across the four tiers.

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Sudoku easy kids Answer key

Easy Printable Sudoku 1

Easy printable sudoku PDF with a verified answer key.

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Sudoku easy kids Answer key

Easy Printable Sudoku 2

Easy printable sudoku PDF with a verified answer key.

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Sudoku easy kids Answer key

Easy Printable Sudoku 3

Easy printable sudoku PDF with a verified answer key.

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Sudoku easy kids Answer key

Easy Printable Sudoku 4

Easy printable sudoku PDF with a verified answer key.

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Sudoku easy kids Answer key

Easy Printable Sudoku 5

Easy printable sudoku PDF with a verified answer key.

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Sudoku easy kids Answer key

Easy Printable Sudoku 6

Easy printable sudoku PDF with a verified answer key.

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Sudoku medium adults Answer key

Medium Printable Sudoku 1

Medium printable sudoku PDF with a verified answer key.

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Sudoku medium adults Answer key

Medium Printable Sudoku 2

Medium printable sudoku PDF with a verified answer key.

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Sudoku medium adults Answer key

Medium Printable Sudoku 3

Medium printable sudoku PDF with a verified answer key.

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Sudoku medium adults Answer key

Medium Printable Sudoku 4

Medium printable sudoku PDF with a verified answer key.

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Sudoku medium adults Answer key

Medium Printable Sudoku 5

Medium printable sudoku PDF with a verified answer key.

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Sudoku medium adults Answer key

Medium Printable Sudoku 6

Medium printable sudoku PDF with a verified answer key.

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Sudoku hard adults Answer key

Hard Printable Sudoku 1

Hard printable sudoku PDF with a verified answer key.

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Sudoku hard adults Answer key

Hard Printable Sudoku 2

Hard printable sudoku PDF with a verified answer key.

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Sudoku hard adults Answer key

Hard Printable Sudoku 3

Hard printable sudoku PDF with a verified answer key.

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Sudoku hard adults Answer key

Hard Printable Sudoku 4

Hard printable sudoku PDF with a verified answer key.

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Sudoku hard adults Answer key

Hard Printable Sudoku 5

Hard printable sudoku PDF with a verified answer key.

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Sudoku hard adults Answer key

Hard Printable Sudoku 6

Hard printable sudoku PDF with a verified answer key.

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Sudoku expert adults Answer key

Expert Printable Sudoku 1

Expert printable sudoku PDF with a verified answer key.

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Sudoku expert adults Answer key

Expert Printable Sudoku 2

Expert printable sudoku PDF with a verified answer key.

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Sudoku expert adults Answer key

Expert Printable Sudoku 3

Expert printable sudoku PDF with a verified answer key.

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Sudoku expert adults Answer key

Expert Printable Sudoku 4

Expert printable sudoku PDF with a verified answer key.

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Sudoku expert adults Answer key

Expert Printable Sudoku 5

Expert printable sudoku PDF with a verified answer key.

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Sudoku expert adults Answer key

Expert Printable Sudoku 6

Expert printable sudoku PDF with a verified answer key.

Print Notes

Made for paper

Use the Letter version for US classrooms and the A4 version for international printing. Black-and-white layouts keep ink usage low.

Answer key

This resource includes a separate answer-key PDF.

Paper

Letter and A4 variants are tracked as separate assets with stable download file names.

Classroom use

Print the puzzle page for students and keep answer keys separate for review or self-checking.

FAQ

Quick answers

Are these printable sudoku PDFs free to print?

Yes — every individual puzzle PDF on this site is free to download without creating an account. Simply click the download button on any resource page to save the Letter or A4 PDF to your device. Selected classroom ZIP packs, which bundle multiple sheets into one download, are also available from the pack pages at no cost.

Do the puzzles include answer keys?

Yes. Word search, sudoku, maze and hidden picture sheets each include a separate answer-key PDF download. The answer key is a distinct file so teachers can hand out puzzle pages to the whole class while keeping solutions private until review time. On each resource page, look for the Answer Key download button below the main puzzle download.

Can I print on A4 paper?

Yes. Every puzzle is available in both US Letter (8.5 × 11 in) and international A4 (210 × 297 mm) format. Choose the variant that matches your printer — both produce the same puzzle with margins optimised for that paper size. No rescaling in your print settings is needed.

Can I use these printables in a classroom?

Yes, all printables on this site are free to print and use in classroom, homeschool and tutoring settings. You can reproduce individual sheets for an entire class. Answer keys are provided as separate downloads so you can distribute puzzle pages without giving away solutions. For large batches, the classroom ZIP packs on the packs page bundle multiple sheets into a single download.

How many printable sudoku sheets are in this collection?

This collection currently contains 24 printable sheets. Each sheet has a Letter PDF, an A4 PDF and — where applicable — a separate answer-key PDF, so the actual number of downloadable files is higher. New sheets are added regularly across all themes and difficulty levels.