Puzzle and activity books
Puzzle books are one of the largest categories in self-publishing, and one of the few where the design is judged before a word is read. The reader opens the book, looks at a grid, and decides in a second whether it is comfortable to work in.
Everything follows from one fact: the reader writes in this book. That changes the paper, the binding and the layout, and it makes several habits from ordinary book design actively wrong.
Grids have to be big enough to write in
Not to read — to write in. A number penciled into a sudoku cell by an adult hand needs far more room than the printed digit that labels it, and a crossword letter in ballpoint needs the same.
This pushes two decisions most people get wrong on the first attempt:
- One puzzle per page. Two puzzles on a page halves the cell size and doubles the frustration. The exception is short-form work — quick anagrams, a small maze for a child — where the writing is a word rather than a grid.
- A larger trim than instinct suggests. Authors default to the novel trims they have seen, then discover the grid has to shrink to fit the margins. Decide the cell size first, multiply it out, add the margins, and let that arithmetic choose the trim. Choosing a trim size covers what each printer will take.
Leave the margins generous while you are at it. A hand resting on the page needs somewhere to rest that is not the grid, and the gutter table applies here as a floor rather than a target: up to 300 pages, 0.5 in; 301–500, 0.625; 501–700, 0.75. Nothing writable belongs near the fold, because in a glued paperback that part of the page curves away into the binding.
Show-through matters more than in any other book
In a book people only read, paper is a preference. Here it decides whether the product works, because the reader is adding ink of their own.
A ballpoint indents the sheet and shows on the reverse. A gel pen, a rollerball or a felt tip soaks into thin stock and comes through. Once a page bleeds through, the page behind it is spoiled — and if that page carried another puzzle, the book destroys itself as it is used. Two real options, and both cost something:
- Take the heaviest stock your printer offers, and test a proof with the pen your reader will actually use, not with a pencil. Paper weight, opacity and show-through has the trade in full.
- Leave the back of each puzzle page blank. Print-on-demand prints both sides of every sheet, so "single-sided" really means putting a blank page after each puzzle — which roughly doubles the page count and the print cost. Sometimes that is the right call anyway, particularly for mazes and drawing pages.
White stock also holds a crisp grid line better than cream, and cream bulks thicker — 0.0025 in per page against white's 0.002252 at KDP — which matters when you are already running a high page count. White or cream paper? makes the choice.
In the Interior Formatter. Full-page plates and inline images are how finished grids get onto the page, and each one is checked against the size it will actually print at — so an image that will go soft at full page is caught before the proof does it for you. Start your interior → · about the Interior Formatter
Grids are images, so check them at printed size
Most puzzle grids are generated elsewhere and placed as images. The number that decides whether they work is pixels divided by the inches they occupy on paper, not the pixel count of the file.
Aim for 300 pixels per inch at printed size, and treat anything under 200 DPI at printed size as a warning. A full-page grid on a 6 × 9 page with bleed covers 6.125 × 9.25 in, which is 1,838 × 2,775 pixels at 300 DPI. Grid rules are hairlines, and hairlines break up first when resolution falls short. Resolution: why a good-looking image prints badly explains the mechanism.
Consistency is the whole quality signal
A reader works through dozens of these pages in a row, which makes drift visible in a way it never is in prose. Every grid the same size, in the same position, with the same margins and the same caption placement. A grid sitting 2 mm lower on page 40 than on page 39 reads as carelessness even to someone who could not say what changed.
Set one page template and do not improvise inside it. If a puzzle genuinely needs more room, change the whole run rather than that one page. The same goes for difficulty: if the book is labeled easy to hard, the progression has to be real and steady, or a reader who hits a hard grid on page six stops trusting the labels.
Numbering and the solutions section
Get this wrong and the book is unusable, which is worse than ugly.
- Number every puzzle, visibly, in the same place on every page. Not the page number — the puzzle number. A reader checking an answer is looking for puzzle 34, not page 71.
- Solutions go at the back, in a block, numbered to match exactly. Check the whole run by hand at least once; an off-by-one in a solutions section is the review that sinks a book.
- Set solutions smaller than the puzzles. They are consulted, not worked in, and the smaller size also keeps the section from doubling the book.
- Never let a solution show through to a puzzle. An answer printed on the reverse of a working page, or facing one, hands the reader the answer. Keep solutions in their own block, and check what sits on the back of each page.
The back of the book is also where your next sale lives — see The back of the book is where your next sale is.
This is the book that most wants to lie flat
A perfect-bound paperback springs shut, and a reader with a pen in one hand cannot hold the book open with the other. Spiral, wire-o and lay-flat bindings solve it completely.
The honest cost is the printed spine: a coil-bound book has none, so it cannot be shelved or scanned, and most retail distribution will not take it. Books that need to lie flat sets out the trade, and Workbooks, journals and books people write in covers the rest of what a writable page needs.
Large print is the underserved end
Large print puzzle books are in short supply relative to the readers who want them, and those readers are exactly the ones who work through puzzle books steadily. It is the clearest gap in the category.
For a puzzle book, large print mostly means a bigger grid on a bigger page rather than bigger body type: fewer cells, more room per cell, heavier rules, stronger contrast between rule and paper. For the text around the puzzles — instructions, clue lists, section openers — the Large Print edition is its own setting, at 6 × 9 and 16 pt, set in Luciole, a face drawn for low-vision readers. The large print edition most authors never make has the detail.
Typeset your book
The Interior Formatter is free to use: name your book, bring your manuscript, and it sets real pages you can read before you commit to anything. You only pay when you want the files without the preview watermark.
Next: Workbooks, journals and books people write in · More: Books that need to lie flat · Paper weight, opacity and show-through · The large print edition most authors never make