kdp · puzzle books
Puzzle books for KDP, ready to upload.
Sudoku, word search and maze books, each with the interior PDF, the full wrap cover and a signed check of both files against KDP’s paperback specs. From $3.30 a book, no subscription.
500 credits a book24 to 470 pages5 trim sizes · white or creamlarge print optionready in 3 to 20 s
what you download
One ZIP per book. Upload two files.
- interior.pdfThe inside pages: title page, how-to page, puzzles, full solutions. Fonts embedded, margins and gutter set for the page count.
- cover.pdfBack, spine and front on one page with 0.125 in bleed. Spine width from KDP’s formula for your page count and paper.
- check-report.pdfOur check of both files against KDP’s paperback specs, signed. Anyone can confirm it is genuine on the verify page.
- listing.txtTitle, subtitle, description, seven keyword ideas and the print options to pick on KDP.
- preview/Six images of real pages for your listing, A+ content or posts.
- README.txtThe upload steps, the book seed and the report id.
Every image on this page is a page our program made for a sample book, shown as delivered. Each puzzle is checked by a second, independent program before it is printed: one solution per sudoku, each word exactly once per word search, one route per maze.
make a book · 500 credits
Choose the book. Download the files.
Your book appears here: the ZIP to download, its page count and the link to its signed report.
free · no key · 20 a day
Free tools for any KDP paperback.
Spine width and cover size
Check your files before you upload
book credits · one-time · never expire
$5 a book, or $3.30 in the big pack.
the guarantee
If KDP rejects a book’s files within 30 days of making it, write to data@voiddo.com with the report id and KDP’s message, and the book’s 500 credits go back to your key. Unused credits can be refunded within 14 days of purchase.
| mint | KDP Builder | |
|---|---|---|
| Smallest pack | $15 for 3 books, $5.00 a book | $8.99 for 100 credits, listed as “≈ 1 puzzle book” |
| Largest pack | $99 for 30 books, $3.30 a book | $89.99 for 1,500 credits, listed as “≈ 10–15 puzzle books”, $6.00 to $9.00 a book |
| Credit cost of a book | 500 credits, always | “~100–150 credits per book” |
| Cover | Typeset by our program from the book’s own puzzles; no pictures | “AI generates a professional cover” |
KDP Builder figures and quotes from kdpbuilder.com/pricing and its puzzle book page, read on 21 October 2026. Their per-book price is their own estimate in credits; check their page for today’s numbers.
Questions
Will KDP accept the files?
Each book passes our own check against KDP’s published paperback specs before you can download it: page size, page count, embedded fonts, margins and gutter for the page count, cover size and spine. If KDP still rejects the files within 30 days, the book’s credits come back.
Do I answer “yes” to KDP’s AI-generated content question?
Here are the facts, so you can answer from KDP’s own definitions. The puzzles, the solutions, the page layout and the cover design are made by ordinary computer programs, not by an AI model, and the covers have no pictures. The fixed wording every book shares (the how-to page, the back cover text, the listing description) and the word search theme lists were drafted with an AI writing tool when the program was written. The choice and the responsibility are yours as the publisher.
Can I sell the books under my own name?
Yes. Put your name or imprint in the author field. Every book without a seed gets new puzzles; the same seed and settings make the same book again, which is how you can rebuild a book later.
Do I need an ISBN?
No. KDP gives a free ISBN to paperbacks, and puzzle books with full solutions are not treated as low-content books, so the free ISBN is available. listing.txt says which options to pick.
Which sizes and page counts?
Trim sizes 6 × 9, 7 × 10, 8 × 10, 8.5 × 11 in and A4, white or cream paper, 24 to 470 pages. The form shows how many puzzles fit for each choice.
Can I use the API instead of this page?
Yes: POST https://data.voiddo.com/v1/kdp_puzzle_book with the same fields as JSON and your key in the Authorization header. The spine calculator and the file check are kdp_spine_calc and kdp_preflight. See the API docs.