--- title: "How to make and sell sudoku books on Amazon KDP | Once Books" description: "A practical 2026 guide to making sudoku books for Amazon KDP: a difficulty curve, single-solution grids, interior specs, a solutions section and upload." source: "https://www.oncebooks.com/blog/how-to-make-and-sell-sudoku-books-on-kdp" --- 1. [Home](https://www.oncebooks.com/) 2. [Blog](https://www.oncebooks.com/blog) 3. How to make and sell sudoku books on Amazon KDP Blog # How to make and sell sudoku books on Amazon KDP [The Once Books team](https://www.oncebooks.com/authors/team) · 22 September 2026 · 8 min read - [kdp](https://www.oncebooks.com/blog/tag/kdp) - [sudoku](https://www.oncebooks.com/blog/tag/sudoku) - [low-content publishing](https://www.oncebooks.com/blog/tag/low-content-publishing) Sudoku is one of the steadiest corners of Amazon KDP's low-content shelf: the demand is year-round, the audience is broad, and a good book is mostly a matter of a clear difficulty level and a clean, large-print interior. The value is in the format, not any prose. This guide walks the whole path, from picking a level to uploading a [print-ready](https://www.oncebooks.com/glossary#print-ready) file, and you can make your first puzzle free in a browser before you commit to a full book. ## What "low-content" means for a puzzle book A [low-content book](https://www.oncebooks.com/glossary#low-content-book) has little or no written manuscript, because the reader does the work of solving the puzzles. That changes what you produce. You're not writing chapters; you're laying out graded grids and their solutions onto pages sized for print at a [KDP trim size](https://www.oncebooks.com/glossary#kdp-trim-size) that passes review. A sudoku book lives or dies on two things: every board having exactly one solution, and grids big enough to write in. Ambiguous puzzles and cramped layouts are the two complaints that sink these books, and the generation step fixes both before you ever lay out a page. ## Step 1: pick a level and an audience, not just "sudoku" "Sudoku" is far too broad to rank or sell. A niche is a difficulty plus an audience: easy large-print sudoku for seniors, a hard-to-evil book for enthusiasts, a gentle for-beginners book, or a graded set that climbs from easy to expert. Pick something specific enough that the book is obviously for one person. Large print is the demand in much of this niche, not a nice-to-have, and a [large-print sudoku](https://www.oncebooks.com/sudoku/large-print) set is a strong first book. ## Step 2: make the puzzles Try the [free sudoku generator](https://www.oncebooks.com/tools/sudoku-generator) first. Pick a difficulty, press generate, and you get a printable board with exactly one solution, plus its solution page, with no sign-up and no watermark. It's the same solver our studio uses, so what you see is what a book page will look like. A whole book needs more than one board. When you're ready, the [KDP sudoku maker](https://www.oncebooks.com/kdp-sudoku-maker) generates hundreds of graded 9 by 9 puzzles across a difficulty curve, verifies each one has a single solution, and builds the [solutions section](https://www.oncebooks.com/glossary#answer-key) at the back. You unlock a project once for $4.99 and export it as many times as you like. ## Step 3: get the interior specs right This is where most first books fail review. Every KDP paperback needs correct margins, a [gutter margin](https://www.oncebooks.com/glossary#gutter-margin) that grows with page count, and, if anything runs to the page edge, [bleed](https://www.oncebooks.com/glossary#bleed). The studio sizes all of this per trim, and a preflight check reads the file against KDP's own rules before you upload, so an out-of-spec export gets caught rather than rejected by Amazon. The short version: pick a common trim, keep a roomy outer margin around each grid, and let the tool size the gutter for your page count. We wrote the exact numbers up in the [word search interior specs guide](https://www.oncebooks.com/blog/kdp-word-search-interior-specs), and the margin and gutter maths are the same for sudoku. ## Step 4: pair every puzzle with its solution A book of unsolvable puzzles gets returned. Every board needs a matching solution, and the solutions need to be easy to find. The studio packs a numbered solutions section at the back, in the same order as the puzzles, so a reader can check any board in seconds and every solution is the one and only answer for that grid. ## Step 5: make a cover and set up the listing The studio exports a print-ready wraparound cover PDF alongside the [interior PDF](https://www.oncebooks.com/glossary#interior-pdf): back, spine and front on one sheet, sized to your page count. For this niche a simple, high-contrast title over a solid background is enough, so you don't need a designer. If you'd rather build your own, KDP's cover calculator gives you the exact wrap dimensions for your page count. For the listing, write a title and subtitle that name the level and format, such as "Large Print Easy Sudoku for Adults, 120 Puzzles", fill the seven keyword slots with phrases a buyer would type, and choose two browse categories. ## Step 6: understand the maths KDP pays a royalty after printing costs, and for a black-and-white paperback printing is priced per page. A large-print book with fewer, roomier pages can be more profitable than a cramped one, so don't pack four tiny grids onto a page to save paper. Price in the range buyers expect for the niche, usually a few dollars, and let the catalogue earn over time rather than any single title. ## A realistic first project Make one free puzzle to see the output. Pick a specific level and audience. Generate around 120 graded puzzles with solutions in the [studio](https://www.oncebooks.com/kdp-sudoku-maker), export the interior at a large-print trim, make a simple cover, and upload. Then do it again for the next level. The earning comes from a shelf of focused books, each easy to find because it's clearly for one reader. If word search or crossword suits you better, the same studio makes those too, starting with [how to make and sell word search books on KDP](https://www.oncebooks.com/blog/how-to-make-and-sell-word-search-books-on-kdp). ## Try the tool Free, in your browser, no sign-up. Make one, then build the whole book in the studio. [Sudoku generator Pick a difficulty and print a sudoku plus its solution. No watermark. Try it free](https://www.oncebooks.com/tools/sudoku-generator) ## Questions parents ask **Do sudoku books sell on Amazon KDP?** Yes. Sudoku is one of the most durable low-content niches on KDP, with year-round demand from adults and seniors. It is competitive, so a clear difficulty level and a clean, large-print interior matter more than volume. **How many puzzles should a sudoku book have?** Most sudoku books run 100 to 200 puzzles, each with a matching solution. Around 120 graded puzzles is a common, well-reviewed length that still prints at a comfortable page count. **Does every puzzle need exactly one solution?** Yes, and it is the thing buyers complain about most when it is missing. A puzzle with two solutions or none gets returned. Every board in the studio is verified by a solver to have exactly one solution before it reaches a page. **Do I need design skills to publish one?** No. The interior and the solutions section are generated from a difficulty curve you choose, and the cover can be made from a template. You need a niche, a difficulty range and a print-ready interior PDF, not design skills. ## Related reading - [Word search books for kids on KDP: what sells](https://www.oncebooks.com/blog/word-search-books-for-kids-on-kdp) — How to make a kids word search book that sells on Amazon KDP: big grids, short familiar words, no diagonals, bright themes. The choices that fit a child. - [Sudoku, word search or crossword: which to start with](https://www.oncebooks.com/blog/sudoku-word-search-or-crossword) — An honest comparison of the three big low-content puzzle formats for KDP: how each is made, who buys it, and where each one is harder to sell. - [How to make and sell maze books on Amazon KDP](https://www.oncebooks.com/blog/how-to-make-and-sell-maze-books-on-kdp) — A practical guide to maze books: picking a shape and an age, grading the book, provable answer keys, large print that means something, and the interior. ## Keep reading - [Answers](https://www.oncebooks.com/answers) — One sharply-scoped question per page, cost, safety, timing, printing, answered in a couple of sentences before the detail. - [Glossary](https://www.oncebooks.com/glossary) — Plain definitions of the vocabulary: the Character Sheet, the Consistency Engine, style profiles, drift. - [Help centre](https://www.oncebooks.com/help) — Task-shaped instructions for making, printing and sharing a book once you have started one. [← All posts](https://www.oncebooks.com/blog) Try this tool [Sudoku generator Pick a difficulty and print a sudoku plus its solution. No watermark. Try it free](https://www.oncebooks.com/tools/sudoku-generator)