A Hitori book on Kindle Direct Publishing is a shading puzzle dressed as a number grid. Every cell already holds a digit. The solver crosses out duplicates by shading cells until no number repeats in any row or column among the cells left white, shaded tiles never touch edge to edge, and the white cells stay one connected group. In Amazon’s Look Inside preview that full grid is the whole pitch: it does not look like another empty sudoku interior, and that difference is why publishers reach for Hitori when they want shoppers who browse number puzzles without blending into the crowded sudoku aisle.
Hitori in Puzzle Maker Pro builds those pages from grid size and difficulty only — no word list, no picture hunt, no cage arithmetic. What follows is what the buyer must see in the sample, how page count and answer keys affect print cost, which edition you need for a one-off book versus a graded series, and two worked interiors with real page math. For the rules lesson, use How Hitori Puzzles Work. For export buttons and Time Saver batching, use How to Create Hitori Puzzles.
Why this interior is not “another sudoku book”
Sudoku Look Inside pages train shoppers to expect empty cells and a slow fill-in. Hitori trains them to expect a dense number field and a shading decision. If your cover still reads like sudoku — nine-by-nine empties, “brain training” without naming the mechanic — the preview will feel like a bait-and-switch even when the puzzle is fair.
The commercial angle is narrow but real. You are not promising a secret algorithm that ranks a listing. You are promising a mechanic serious solvers recognize, with interiors you can repeat across a series. Hitori also ships without licensing a word list or commissioning art for every page, which keeps a 100-puzzle title cheap to produce once your trim size and key placement are settled.
What Look Inside has to prove
Amazon shows a fixed slice from the front of the file. You choose what sits in that slice.
Show a real board at print size. Page one should not be a copyright essay. A short title page, a one-sentence rule, and a puzzle that matches the cover promise — large print means large cells on page two, not on page forty.
Show the shading look, not only the starting grid. The puzzle page is numbers on white. The finished puzzle is numbers plus solid dark cells on the solution. Buyers who have never seen Hitori need to glimpse that contrast in the sample or they will assume the book is a sudoku variant with black squares.
The figure shows a typical export layout: one puzzle page with every number visible, paired with a solution page where shaded cells print as a solid fill and the digits underneath are hidden. The render comes from the same Customer JSON shape the product exports; it is not a screenshot of the desktop window.
Name where the answers live. Look Inside rarely reaches the back of the book. Your table of contents and description should state that every puzzle has a solution and whether keys sit after each puzzle, at the end of a section, or in a rear answer block. The general trust argument is in what a Look Inside has to prove; answer-key layout for long books is covered in puzzle book answer keys.
Match grid size to the title. Difficulty in Hitori is mainly how much of the board is shaded (Easy, Medium, or Hard), and those bands sit close together. Grid size is the stronger lever: a 6×6 Easy and a 12×12 Hard are different products, not the same book with a new label. If the cover promises a gentle start, the first puzzle is a small board.
Rules you owe the buyer in one page
You do not need a chapter of strategy in the front matter. One tight rules block is enough:
- Shade cells so no number appears twice in any row or column among the cells left white.
- Shaded cells cannot touch along an edge (diagonal contact is allowed).
- All white cells must stay connected through white cells only.
The Hitori generator keeps only boards that pass its logic-only solve check — one solution, with every cell decided by the same deduction rules a careful solver would use, not by trial and error. You can mention that in the listing copy; you do not need to prove it in the sample.
Settings that matter for a KDP interior
Open Hitori in Puzzle Maker Pro (or a Time Saver batch if you are building a graded series). The fields that change your book are:
| Control | What it does for your listing |
|---|---|
| Grid size (5×5 to 12×12, default 8×8) | Sets cell size on the page and how long a solve runs. Twelve-by-twelve needs more trim width than six-by-six for the same pencil comfort. |
| Difficulty (Easy / Medium / Hard) | Adjusts how many cells are shaded in the finished puzzle — not whether guessing is required. All bands use the same logic guarantee. |
| Quantity | Puzzles per generation run. Preview and the demo always produce one puzzle. |
| Style (Creative and above) | Fonts, line colors, and fills for numbers, canvas, cell fill, borders, and the Shaded cell fill on solution pages (default solid near-black). Tune that shade before you export and proof a key page on the paper you plan to sell. |
| Layout / smart titles | Optional titles such as “Hitori 8 × 8” on the image; book assembly still happens in Instant Puzzle Books or Puzzle Book Studio. |
Static exports include PNG, JPG, SVG, and PDF. Assemble a print-ready PDF with Instant Puzzle Books when you want a straight book from current settings, or Puzzle Book Studio when you need per-page layout control, mixed front matter, or multiple collections in one volume.
Editions for a KDP paperback. Every Hitori edition includes Instant Puzzle Books. Hitori (the base product) generates number-only puzzles and static PNG, JPG, SVG, and PDF exports. Hitori Creative adds full style control (including the solution Shaded cell fill), content variation (letters, color shapes, or images instead of numbers), and Puzzle Book Studio for layout work on a single collection. Hitori Productivity adds Time Saver batching, Puzzle Book Studio for multi-collection books, and Customer JSON export for your own workflows. Hitori Creative Interactive and Hitori Productivity Interactive add Puzzle Slides (interactive decks with draggable shade tiles) and Online Play on your own site only — not part of the KDP paperback. Edition details: Puzzle Maker Pro Editions Explained. You can move up to a higher Hitori edition later if you start with a single-title run.
Commercial rights. Hitori and Hitori Creative both let you sell the finished books, worksheets, and packs you make to your own readers and customers. Hitori Productivity includes that, plus you may sell or supply the generated puzzles to other publishers and sellers. The tiers differ in what you can make, not in permission to sell to your own audience.
Production facts: page pairs and dark keys
Treat each Hitori as a puzzle page plus answer page. Eighty puzzles is roughly 160 interior pages before title, contents, and blanks — enough to clear common print minimums. More pages raise printing cost per copy, which lowers net royalty at a given list price. Padding tiny 5×5 boards only to inflate page count reads as a thin book; a visible climb in grid size earns the length.
Solution pages print shaded cells as a solid near-black fill by default and hide the number underneath. That ink load is heavier than a sudoku key. Proof on the paper stock you will sell, watch for show-through when keys face puzzle pages, and consider a rear answer section instead of printing the solution on the back of each puzzle. On typical boards, about one cell in four is shaded on easier bands and a little more on Hard — still enough ink to matter on a long answer block. Number puzzle books for KDP shows the same pattern on a six-by-six pair.
Worked scenario 1 — 60-puzzle large-print starter (8.5×11)
Goal. A first paperback for adults who want shade logic without a 12×12 eye test.
Settings. Grid size 6×6, difficulty Easy, quantity 60. Export PNG or PDF per puzzle and solution. In Puzzle Book Studio or Instant Puzzle Books, use one puzzle per page at roughly 7×7 inches of play area on US Letter, with margins that survive KDP’s bleed check.
Page math. Title page, copyright, one-page how-to-play, table of contents (two pages once puzzles and solutions are listed): 5 pages. 60 puzzle pages. 60 solution pages. That is 125 authored pages; KDP paperbacks need an even page count, so allow one blank page at the end for a 126-page interior when you upload. Price the list price for that print cost, not for a pamphlet-sized book.
Recommendation. Ship this before a 10×10 volume. The Look Inside sample is instantly legible, and the 6×6 grid signals “accessible” without hiding the shading mechanic.
Worked scenario 2 — 100-puzzle climb with Time Saver (8×10)
Goal. A series backbone book that grows difficulty by size for repeat buyers.
Settings. Use Time Saver on Hitori Productivity with a ramp: batch lines from 6×6 Easy through 8×8 Medium to 12×12 Hard, 20 puzzles per line (100 total). Keep numbers as cell content for the first edition so the series stays visually consistent. Generate once, export, then assemble in Puzzle Book Studio if you want section titles (“6×6”, “8×8”, “12×12”) and a single answer block.
Page math. Front matter 6 pages (add a one-page difficulty note). 100 puzzle pages. 100 solution pages. Total ≈ 206 pages. Price the paperback for the page count — this is a long single-type logic book, not a pamphlet.
Recommendation. Use this shape when you already sold the 6×6 starter and want a “volume 2” that is obviously harder. Grid size carries the promise; band labels support the section headers.
Series ladder on KDP
A three-title ladder is easier to market than one mixed grab bag — each cover can name one grid size and one difficulty story:
- Small / large print — 5×5 or 6×6, Easy band, short solves.
- Mid-size — 8×8 or 9×9 daily-driver size.
- Challenge — 10×10 to 12×12 for the buyer who finished volume 2.
Creative content variation (letters or pictures) is a different catalog line — market it to kids or themed buyers with a new subtitle, not as “volume 4” of the plain number edition. The puzzle book series on KDP pattern applies the same way here: repeat trim, repeat key placement, change only the size or theme you advertise.
What not to list this paperback as
Do not call it sudoku or “sudoku variety” if the interior is full Hitori grids. Do not upload the KDP PDF as a Teachers Pay Teachers worksheet or an Etsy ten-page pack — channel expectations for length and keys differ; see interiors versus printables versus worksheets. Do not promise a browser game inside the paperback; Online Play on your own site requires Hitori Creative Interactive or Hitori Productivity Interactive and stays separate from the print book.
This is general publishing guidance about product shape and buyer expectations, not legal advice about copyright or trademarks.
Other puzzles you might like
If you want the wider non-sudoku number category — hidden-term sequences, cage arithmetic, and 0/1 grids alongside Hitori — read number puzzle books for KDP, which compares four puzzle types and when each earns its own title. For short themed packs instead of a 120-page paperback, the Etsy-side sizing notes live in number puzzle printables for Etsy. When you are ready to click Generate, the step-by-step walkthrough is How to Create Hitori Puzzles.