5 Best Puzzle Types for KDP Activity Books (Q4 2026)

Picking a puzzle type is the first real decision in any KDP activity book, and it shapes everything after it: trim size, page count, price and who you are selling to. Some types have huge demand and crowded shelves, others have smaller audiences with far less competition.

This guide rates the five puzzle types worth publishing, using the competition levels shown in the PuzzlePage Book Studio, real counts of what publishers are building there, and KDP's published print costs. It was refreshed in October 2026 for the Q4 gift season.

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Which puzzle types sell best in KDP activity books?

Themed word search and sudoku sell in the biggest numbers, while cryptograms and word fill-in offer the easiest path past competitors. The right choice depends on whether you want the largest audience or the least crowded shelf.

1. Word search: broadest appeal, theme is everything

Word search is the most widely bought puzzle format, and it is also the easiest to commoditize. A generic word search book competes on price; a themed one competes on who it is for.

It is also where most publishers start. Of 103 template starts in our Book Studio by mid-October 2026, 22 were large print word search for seniors and 17 were Christmas word search, the two most popular choices.

Best themes now: large print for seniors, Christmas and winter, gardening, birds, classic TV, and hobby or profession word lists. Start from the large print template or the Christmas template, and test single themes in the free word search maker.

2. Sudoku: highest volume, highest competition

Sudoku has the widest audience in puzzles and works in any language, so one book sells across every English-language Amazon store. That also makes it the most crowded shelf.

Reviewers reward a clear difficulty ramp, so build the book from easy to hard. The Sudoku: Easy to Expert template lays out 100 puzzles in three difficulty sections on a 6 x 9 trim, and the free sudoku generator makes single test pages.

3. Cryptograms: low competition, loyal solvers

Cryptogram books have a devoted adult audience and a thin shelf, because a good cryptogram book needs good quotes and a reliable cipher generator. Curation is the product here: a themed collection beats a generic "inspirational quotes" book.

Stick to public domain sources, such as works published in the United States before 1931. The Cryptogram Quote Collection template starts with 45 encrypted quotes you can swap for your own, and our cryptogram catalog guide covers building a series.

4. Word fill-in: the underserved format

Word fill-in puzzles give the reader a list of words and an empty crossword-style grid to place them in. Crossword fans who want the grid without the clues love them, and far fewer books serve that reader.

The Word Fill-In template builds 100 puzzles, and the free word fill-in maker is a quick way to check the format suits your theme.

5. Mixed and kids activity books: strong gift appeal

A mixed book carries several puzzle types under one theme, which feels like more value to a gift buyer. Kids activity books do the same for ages 8 to 12, mixing mazes, word searches and scrambles at a level a child can solve alone.

Both peak in November and December, when parents and grandparents shop for stocking fillers and winter break. Start from the Big Variety Puzzle Book or the Kids Activity Book template.

Which puzzle type should you publish first?

Pick by your goal, not by the format. If you want the least competition, start with cryptograms or word fill-in; if you want the biggest audience, start with themed word search; if you want a Q4 gift title, start with a Christmas or mixed book.

What does each puzzle type earn per copy?

Royalty depends on trim and price more than on puzzle type. KDP pays 60% of list price at $9.99 or more and 50% below it, minus a printing cost that is flat from 24 to 110 pages.

A 110-page 6 x 9 sudoku book costs $2.30 to print and earns about $3.69 at $9.99. A 110-page 8.5 x 11 large print word search costs $2.84 and earns about $3.15 at the same price, per KDP's printing cost table.

Check your own book in the free KDP royalty calculator, and compare Book Studio plans when you are ready to export a full interior. Every free KDP tool lives on the KDP hub.

Frequently Asked Questions

Which puzzle type is easiest to publish on KDP as a beginner?

Word search and word fill-in are the easiest first puzzle types for KDP activity books, because the rules need no explaining and a theme does most of the selling. Word fill-in also sits in a low-competition corner, which gives a new title more room to be found.

Which KDP puzzle type has the least competition right now?

Cryptograms and word fill-in carry the lowest competition of the common puzzle types, because good ones need real tooling to generate. Sudoku sits at the other end: it has the most buyers and the most competing books.

How many puzzles should a KDP activity book contain?

About 100 puzzles is a common target; the median book built in the PuzzlePage Book Studio holds 100. Sudoku buyers like volume and a clear easy-to-hard ramp, while cryptogram buyers are happy with 45 to 60 well-chosen quotes.

Are word search books still worth publishing on KDP?

Yes, with a theme. Generic word search books compete mostly on price, while themed ones such as large print for seniors, Christmas, gardening or a hobby give the buyer a reason to choose yours.