# KDP puzzle book generators compared (2026): word search, sudoku, mazes

Source: https://kdpbook.io/best/kdp-puzzle-book-generators · Updated 2026-10-04

We make kdpbook.io, so it is listed first; every other entry is described from its own public pages, checked 2026-10-04. Which tools make a KDP puzzle book with answer keys? Checked on October 4, 2026: kdpbook.io, Once Books, KDPage, KDPEasy, SmartKDP and Self Publishing Titans generate whole interiors with solutions; Book Bolt builds puzzles in its design Studio. kdpbook.io's free makers print one page of puzzles at a time. Puzzle books need an ISBN, and Expanded Distribution may decline them.

- kdpbook.io (https://kdpbook.io): Interior PDF with solutions, full-wrap cover PDF and listing sheet; print only, no Kindle file. KDP print files: Yes: 6 trims, margins applied, with a preflight check. Kindle eBook: No: print only (KDP lists puzzle books as unsuited to Kindle). Cover: Full-wrap paperback or hardcover cover sized from the final page count. Puzzle types: Word search, sudoku, criss-cross (fill-in), cryptogram, word scramble, maze and hangman. Answer key: Yes: a solutions section at the back (hangman has none). Print file: Interior PDF of 24–300 pages in 6 trims (8.5 × 11, 8 × 10, 6 × 9, 8.27 × 11.69, 8.25 × 11, 8.5 × 8.5), full-wrap paperback or hardcover cover, listing sheet; print only. Paid from $25/month (Starter, 2,500 credits); a 108-page puzzle book or sudoku book is estimated at about 460 credits; free to try: 2,000 credits once, no card (enough for a 108-page puzzle book); exports watermarked, not for sale. Best for: A whole puzzle book from one theme, large print by default: puzzles, solutions, cover and listing in one project. Limits: Print only. No keyword or niche research. Free-plan books are watermarked, not for sale and public in the community library. Source: https://kdpbook.io/pricing
- kdpbook.io free puzzle makers (free, one page at a time) (https://kdpbook.io/kdp): A printable puzzle page (sudoku: up to 6 grids) and its answer-key page, or an SVG file. KDP print files: No: one puzzle page per print on home-printer paper; a KDP interior needs a puzzle book type. Kindle eBook: No. Cover: No. Puzzle types: Word search, sudoku (4×4, 6×6 or 9×9) and mazes (rectangle or circle). Answer key: Yes: on its own page, after the puzzle page. Print file: A puzzle page, then its answer-key page, on US Letter or A4; a PDF through the print dialog's “Save as PDF”; SVG download. Paid from Free; free to try: Free, no account or signup. Best for: Trying a theme or a difficulty, or printing a few puzzles for home or class, before you build a whole book. Limits: One page of puzzles at a time: a whole interior, its cover and the listing need a puzzle book type. Printed pages carry a small kdpbook.io credit line, which you can switch off. Source: https://kdpbook.io/kdp
- Book Bolt (research and design) (https://bookbolt.io/): Puzzle pages and covers you lay out in its Studio. KDP print files: KDP-ready PDFs from Studio templates. Kindle eBook: Not documented. Cover: Designed by you in Book Bolt Studio. Puzzle types: Sudoku, crosswords, word searches, cryptograms, mazes, Hangman, Minesweeper and more. Answer key: Not documented. Print file: Interior and cover PDFs exported from Book Bolt Studio at KDP sizes. Paid from $19.99/month billed yearly (Pro, 1,000 AI credits); free to try: 3-day free trial, real exports included. Best for: Niche and keyword research, then designing puzzle books from templates. Limits: Research is its core, and answer keys aren't described on its pages. Source: https://bookbolt.io/studio/
- Once Books (Publisher Studio) (https://www.oncebooks.com/): Interior PDF, answer-key PDF and wraparound cover PDF for each book. KDP print files: Yes: 300 DPI interior PDF at any of KDP's 17 trims. Kindle eBook: Kindle fixed layout listed among its print platforms. Cover: Wraparound cover sized to the page count. Puzzle types: Word search, sudoku (easy to evil), crossword and 3D spatial puzzles; mazes listed as coming soon. Answer key: Yes: a separate answer-key PDF; sudoku solutions are also packed at the back of the interior. Print file: 300 DPI interior PDF at any of KDP's 17 trims, with a wraparound cover sized to the page count. Paid from $4.99 per book (one project, paid once; no subscription); free to try: Free browser generators (one puzzle and its answer page, no account, no watermark); building and previewing a book is free. Best for: One puzzle book at a time without a subscription, re-exported at any trim. Limits: Four puzzle kinds are live (mazes are listed as coming soon). The free generators print one puzzle; each $4.99 unlock covers one book. Source: https://www.oncebooks.com/pricing
- KDPage (https://kdpage.com/): Puzzle book interior PDF with solutions, a matching cover, SVG puzzles. KDP print files: Interior PDF at 6 × 9 or 8.5 × 11 in on Starter, all sizes on Pro Studio. Kindle eBook: Not documented. Cover: A cover creator that sizes the spine from page count, paper type and bleed. Puzzle types: Word search, sudoku, mazes, cryptograms and word scrambles. Answer key: Yes: 4- or 6-per-page answer grids at the back of the interior PDF. Print file: Book Studio interior PDF (8.5 × 11 in, up to 200 pages) with page numbers and a matching cover; SVG per puzzle. Paid from $11.99/month (Starter Creator: easy and medium sudoku, 6 × 9 and 8.5 × 11 in); free to try: Basic puzzle generators; PDF exports are watermarked samples. Best for: Low-cost puzzle interiors with solution grids, next to free KDP calculators. Limits: Crosswords, kakuro and hard sudoku need Pro Studio ($21/month); Starter exports two trims. Source: https://kdpage.com/tools/kdp-puzzle-generator
- Self Publishing Titans (research and design) (https://selfpublishingtitans.com/): Puzzle and activity pages as a print-ready PDF. KDP print files: Print-ready PDF formatted for KDP paperback interiors. Kindle eBook: Not documented. Cover: Book Cover Creator (basic on Hobbyist, full from Author). Puzzle types: 111 generators: sudoku and variants (jigsaw, samurai), word search, crossword, kakuro, nonogram, cryptogram, logic grid, mazes, math and early-learning pages. Answer key: Solution pages for supported puzzle types. Print file: Print-ready PDF formatted for KDP paperback interiors. Paid from $25/month billed yearly (Author, which adds the Puzzle Maker); $35 monthly; free to try: Free KDP calculators; the Puzzle Maker needs a paid plan (7-day money-back guarantee). Best for: A very wide range of puzzle and activity pages, next to Amazon research tools. Limits: Its plan table counts 70 puzzle tools while its puzzle page lists 111 generators. The Puzzle Maker isn't in the Hobbyist plan. Source: https://selfpublishingtitans.com/puzzle-books
- KDPEasy (https://www.kdpeasy.com/): Interior PDF with solutions and a matching cover. KDP print files: Yes: a complete interior PDF for KDP. Kindle eBook: Not documented. Cover: Full-wrap cover from its cover generator. Puzzle types: Word search, sudoku, crossword, mazes, kakuro, KenKen and number search. Answer key: Yes: solutions placed automatically at the back of the book. Print file: One interior PDF (title page, copyright, instructions, puzzles, solutions) and a matching cover. Paid from $19/month (Starter: 35 credits, 7 covers); free to try: 10 credits once after email confirmation, no card; free work carries a watermark. Best for: Puzzle interiors and covers from one account, with keyword research and KDP draft saving. Limits: How many credits a puzzle book uses is not documented on these pages. Its sudoku creator lists 4×4 to 16×16 grids. Source: https://www.kdpeasy.com/features/word-search-creator
- SmartKDP (https://smartkdp.com/): Puzzle interior PDF or fixed-layout EPUB, with the cover and listing in the same project. KDP print files: Interior PDF checked against KDP's trim, font-size, margin and DPI rules. Kindle eBook: Fixed-layout EPUB. Cover: Cover Designer that computes the spine from the book's page count. Puzzle types: 110 generators: word search, crossword, sudoku, kakuro, nonogram, logic grid, maze, cryptogram, color by number, spot the difference, tracing and more. Answer key: Yes: each generator shown comes with its answer key. Print file: Interior PDF in RGB or CMYK/PDF-X1a, plus a fixed-layout EPUB, after a KDP preflight. Paid from $19/month (Creator: every puzzle type, watermark-free export); free to try: Free plan: 6 puzzle types, 3 generations a month, 3 projects; watermarked exports. Best for: Editing generated puzzles by hand (clues, fonts, grid size) before export. Limits: Bulk generation starts on the Publisher plan ($39/month). Its uniqueness check covers your book and your other SmartKDP projects, not every puzzle in print. Source: https://smartkdp.com/book-studio

Q: Can puzzle books use KDP Expanded Distribution?
A: You can try, but distributors may decline them: KDP's Expanded Distribution page lists puzzle books, word search, sudoku, crossword and maze among the topics its distributors may decline. Plan on selling on Amazon.

Q: Do puzzle books need an ISBN on KDP?
A: Yes. KDP's low-content category doesn't typically include puzzle books (its table lists them as not generally low-content), so publish with an ISBN; KDP's free ISBN works for paperbacks and hardcovers.

Q: Can a puzzle book be a Kindle eBook?
A: KDP's content-quality guide lists puzzle books among the books not suited to Kindle, which may be rejected or removed from sale. SmartKDP and Once Books list fixed-layout exports; kdpbook.io makes puzzle books as print books only.

Q: Do I have to disclose AI use in a puzzle book?
A: Only for content an AI tool created: KDP asks you to declare AI-generated text, images or translations. A grid that ordinary code builds from your own word list isn't AI-generated; word lists, clues or quotes written by AI, and an AI-made cover, are. In kdpbook.io's puzzle books, AI writes the themed word lists, clues and cryptogram quotes and paints the cover; the puzzles themselves are built and checked in code.

Q: How much does a puzzle book cost to make?
A: On kdpbook.io, a 108-page puzzle book is estimated at about 460 credits (≈ $5 at the Starter rate), which the free signup credits cover; free-plan books are watermarked and not for sale. Once Books charges $4.99 per book. KDPage, KDPEasy, SmartKDP, Book Bolt and Self Publishing Titans are monthly plans, from $11.99 (KDPage Starter Creator).