Sudoku 9×9 vs Sudoku 3D Cubes
Sudoku is the easiest category to fill and the hardest to tell apart. A shopper opens Look Inside, sees a scatter of digits on a 9×9, and has already decided the listing is interchangeable with the four above it. Covers do not fix that. The first puzzle page does.
This page is the flat-versus-cube pick: a classic 9×9 whose first page is rows, columns, and 3×3 boxes, or a 3D cube whose first page is three faces and a row that folds over an edge. It is not a generate walkthrough. It is not the sudoku variations hub. Wordoku, Jigsaw, and Killer stay there — those are still flat grids. The cube is a different first page, and it belongs on its own listing.
What the shopper sees
Two interiors can both say sudoku on the cover. They cannot share a sample.
Classic 9×9 — the page the shelf already knows
Sudoku 9×9 Creative prints the grid every buyer already knows how to judge: given digits, bold 3×3 boxes, seven named levels from Very Easy to Extreme. The listing sells on volume, grading, and a sample that looks like sudoku the moment it loads.
Creative can put Roman numerals, nine letters, or nine pictures in those same cells. That is a themed cover-to-interior look on classic rules, and the variations hub already owns it. Do not open a second “letter sudoku” listing to make the point. The first page is still a flat 9×9.
3D Cubes — a cube on the page
Sudoku 3D Cubes prints three visible faces of a cube. A wrap-row or wrap-column runs across one face, folds over the edge, and continues on the next, so a line is twice as long as a face is wide. That is why a 4×4 cube uses the digits 1 to 8, not 1 to 4, and why the thumbnail stops looking like every other sudoku book.
The listing look is one cube. Face size 4, Regular strips, forty-eight cells. That is the page a shopper should meet in Look Inside. Larger single cubes (face size 6 and 8) exist for a longer sitting — they win on size, not on a steeper first page. Two- and three-cube boards are later 4×4 titles on the same module, Creative or higher. They are not the default sample.
The logic is still sudoku: each wrap-row, wrap-column, and region holds each digit once. The reader does not need a new hobby. They need a page they have not already skipped.
Which listing to publish first
Pick the page the sample can prove. Then write the title around that page.
Publish the flat 9×9 when the catalog already is sudoku, when the buyer wants the familiar book, and when you need a seven-level ladder on the grid every competitor also ships. A classic interior is not a weak product. It is the product the shelf is built from. The variations hub is how you stop that interior from looking like everyone else’s — Wordoku, Jigsaw, Killer — without leaving the flat family.
Publish the cube when Look Inside has to interrupt the skip. A publisher who already owns a sudoku audience can put a cube on the page and keep the same solvers. A publisher who refused the category because the 9×9 end is crowded can enter on a page the crowded end does not have. The cube is not a harder 9×9. It is a different first page.
Do not mix them as the default listing. A book titled “sudoku and 3D sudoku” has two first pages and no contract a shopper can check. Two titles. The 9×9 book is a 9×9 book. The cube book is a cube book. A later series can carry both as separate volumes; the sample of each volume still has to be one look.
Do not fold the cube into the variations hub. That hub maps how flat variants differ on a 9×9. Adding a cube there would make the hub a catalog dump and steal the query this page is for.
The Look Inside yardstick still applies to both: a real puzzle at true print size, a difficulty story the first pages agree with, and an answer-key promise up front. The cube does not get a pass because it is novel, and the 9×9 does not get a pass because it is familiar.
Etsy packs and TPT worksheets of the flat family are different products with different contracts — those live on the Etsy sudoku printables and TPT sudoku worksheets hubs. This page is the KDP chooser between a flat grid and a cube.
What not to ship
Do not ship a cube listing whose sample is another 9×9. If the first preview page is a flat grid, the cube is not the product.
Do not ship a 9×9 listing whose sample is a montage of variants the book does not keep. The variations hub already says one variant per title.
Do not ship the cube as “harder sudoku.” Face size 4 carries the full seven-band ladder. The bigger single cubes are longer boards, not the Extreme end of the 9×9 shelf.
Do not ship two- or three-cube boards as the first Look Inside. One cube is the listing. The wider boards are later 4×4 titles, Creative or higher, once that look is the one the shopper came for.
Do not invent a price or a bundle story on this page. Commercial rights for the finished books you make are part of the Puzzle Maker Pro license, as stated on the homepage.
The whole point
Look Inside is a flat digit grid or a cube drawing. Wordoku, Jigsaw, and Killer stay on the flat family page. The cube gets its own listing, its own sample, and a title that does not apologize for leaving the 9×9. Pick the page first. Then compose the book so the first preview page is that page.