Wordoku is Sudoku played with letters instead of numbers. Each row, column, and box must contain every letter exactly once — available in 4×4, 6×6, and 9×9 grids.

Do all puzzles have a unique solution?

Yes — every Wordoku has exactly one valid solution reachable by pure logic.

Can I choose my own letters?

Yes — enter N unique letters for an N×N grid (up to 40 characters). Toggle the letter bank on the sheet on or off.

Can I print multiple Wordokus per page?

Yes — pick 1, 2, 4, 6, or 9 puzzles per page across up to 100 pages.

Are the puzzles suitable for kids and ESL learners?

Yes — Wordoku is great for letter recognition, spelling, and logical thinking. Start with Easy difficulty and a familiar word.

Does it work on mobile, iPad, and Chromebook?

Yes. The Wordoku maker runs in your browser — no app required.

Do you store my puzzles?

No. Everything is generated in your browser session. We don't store, sell, or share your data.

Is this worksheet maker really free to use?

Yes — start without a credit card. Manual mode is always free to use and does not spend AI word credits. On the free plan you get 5,000 lifetime AI words (one trial per network), up to 10 PDF downloads per day, and a subtle eduzuma.com watermark on exports. Basic, Pro, and School plans remove the watermark, lift daily limits, and include a commercial resale license.

Do my PDF downloads have a watermark?

Free-plan and guest PDFs include a small eduzuma.com footer watermark. Paid plans (Basic, Pro, School) deliver 100% watermark-free PDFs — the upgrade most teachers and KDP publishers choose.

Is there a daily download limit?

Free and guest users can download up to 10 PDFs per day (tracked in the app). Paid plans include unlimited daily downloads.

Can I sell worksheets or puzzle books commercially?

Classroom and personal use are included on the free plan. Selling on Teachers Pay Teachers, Amazon KDP, Etsy, or similar requires Basic, Pro, or School — each includes a royalty-free commercial license and watermark-free PDFs.

Can I download multi-page worksheet packs on the free plan?

The free plan exports one page per generation. Basic supports up to 5 pages per click; Pro and School support unlimited multi-page packs — ideal for workbook sets, puzzle books, and full classroom packets.

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Wordoku

Puzzles

Sudoku with letters — printable PDF with answer key.

Free Wordoku Maker — Printable Sudoku Puzzles with Letters

Free online Wordoku maker — Sudoku with letters. Choose your own 9-letter set, pick difficulty, and download printable PDF puzzles with answer key. Free to start; upgrade for watermark-free exports.

Free to StartNo Sign-UpEasy to ExpertPDF + PNGA4 & US Letter

Wordoku

Show answers

Generating Wordoku puzzles...

Free Wordoku Maker — Printable Sudoku Puzzles with Letters

Generate unlimited Wordoku puzzles — Sudoku played with letters instead of numbers. Choose 4×4, 6×6, or 9×9 grids, enter your own letter set, toggle the letter bank on the sheet, and download print-ready PDFs with a matching answer key. Perfect for ESL, spelling practice, classrooms, and word-puzzle fans. Free to start; paid plans remove the watermark and unlock commercial resale.

Custom Letter Sets

Enter N unique letters for N×N grids — defaults like MATH (4×4), PENCIL (6×6), EDUCATION (9×9).

Unique-Solution Puzzles

Every Wordoku has exactly one logical solution — pure logic, no guessing required.

Print-Ready PDF Books

Build a full Wordoku pack with up to multiple puzzles per page and an answer key.

How to make a printable Wordoku puzzle in 6 simple steps

From blank page to printable worksheet in under a minute.

1
Choose grid & letters
Pick 4×4, 6×6, or 9×9 and enter N unique letters (toggle letter bank on/off).
2
Pick a difficulty
Easy, Medium, Hard, or Expert — same clue counts as Sudoku for each grid size.
3
Set pages & layout
Up to 100 pages with 1, 2, 4, 6, or 9 puzzles per page.
4
Toggle letter bank
Show or hide the letter bank on the printed sheet for extra challenge.
5
Preview the puzzle
Toggle the answer key to verify difficulty and solvability.
6
Download from the menu
Use the Download menu for puzzle PDF, solution PDF, both, or PNG — A4 or US Letter.

Everything you need in a Wordoku puzzle generator

4×4, 6×6, 9×9 grids

Up to 100 pages

Unique solution guaranteed

PDF + PNG export

Matching answer key

Letter bank toggle

A4 & US Letter

Free to start; watermark-free on paid

Single puzzle mode

Quick daily logic + spelling warm-up
Pick any 9 letters and difficulty
Large-print friendly layout
Re-generate a fresh puzzle in one click

Puzzle book mode

Generate multiple Wordokus at once
Use different theme words per puzzle
Great for ESL packs and gift books
Full answer key included

Who uses our Wordoku maker?

ESL & language teachers

Spelling, letter recognition, and vocabulary practice.

Homeschool parents

Combine logic and literacy in one worksheet.

Puzzle book creators

Self-publish themed Wordoku books in minutes.

Senior centers

Large-print brain training with words.

Word puzzle fans

Endless easy-to-hard letter Sudoku puzzles.

Tutors & coaches

Quick handouts for spelling + logic drills.

Commercial Use Allowed

Members

If you have an active membership plan, you may use the generated worksheets and puzzles for commercial purposes — including selling them to end users on Etsy, Amazon KDP, TPT (Teachers Pay Teachers), WooCommerce & more.

Free plan: personal & classroom use with a subtle PDF watermark. Paid plans (Basic, Pro, School) unlock watermark-free exports and royalty-free resale on TPT, KDP, Etsy & more.