kdp · number fill in books
Number Fill In puzzle books for KDP, ready to upload
Number fill in puzzles, also called number fill its or number criss cross puzzles: an empty grid and a list of numbers, and the solver fits every number in. No words to know and no sums to work, only digits to place. Pick the level, the number of puzzles and the trim size. You get the interior PDF with every solution, the full wrap cover with the spine sized to the page count, and a signed check of both files against KDP’s paperback specs. One price for any number fill in book: 500 credits, from $3.30 in the big pack.
The sample book, as delivered
How every number fill in is checked
- One way to fill the grid. A second program, written apart from the one that makes the puzzles, tries every way to fit the listed numbers into the empty grid, starting from the number already in place, and finds exactly one.
- Clean grids. Every run of two or more boxes across or down is a number from the list, each listed number is in the grid once, the grid is one connected piece and no number touches another side by side.
- Fair numbers. Every number has the digits its level allows, none starts with 0, none is one digit over and over, and the list is grouped by length, each group led by its digit count.
- Full solutions at the back, four to a page on 8 in and wider pages.
What you choose
| Level | Easy (numbers of 3 to 6 digits, up to 14 a puzzle), medium (3 to 7 digits, up to 20) or hard (4 to 8 digits, up to 26); small pages and large print hold fewer numbers, so the boxes stay big |
|---|---|
| Puzzles | 13 to 150 on 6 × 9 in, 16 to 150 on 8.5 × 11 in, one to a page; the form shows the range for each size and level |
| Number list | Under the grid, in the grid’s own typeface, so a digit looks the same in both; the zero is slashed |
| Large print | On by default: boxes of 26 pt and up, the starting number at 16 pt and up, number lists at 18 pt |
| Trim size | 6 × 9, 7 × 10, 8 × 10, 8.5 × 11 in or A4; white, cream or groundwood paper |
| Title and author | Your title, subtitle and name or imprint, printed on the cover, the spine and the title page |
| Cover color | The kind’s own color, or one of fifteen others, so a series of yours looks like no one else’s |
| Cover layout | The puzzle above the title, the title above the puzzle, or the title on a card over the puzzle |
| Seed | The same seed and settings make exactly the same book again; left empty, every book is new |
Questions
What is a number fill in puzzle?
A fill in with digits instead of words. The grid is empty and the numbers are given, grouped by how many digits they have; the solver fits each number into the boxes so that crossing numbers share their digits. One number is in place to start, and every puzzle can be filled in only one way. The book’s how-to page explains the rules on one page.
How is it different from a fill in book?
A fill in book lists words on one theme a puzzle, so it leans on vocabulary and spelling. A number fill in lists only numbers: nothing depends on knowing a word, and there is no theme to pick. Both have one solution a grid and full answers at the back.
Will KDP accept the files?
Each book passes our check against KDP’s published paperback specs before you can download it: page size, page count, embedded fonts, margins and gutter for the page count, line weight, blank pages, cover size and spine. If KDP still rejects the files within 30 days, the book’s 500 credits go back to your key.
Can I make a series?
Yes. One book per level with your series name in the title, or the same level with new grids in each volume: every book without a seed gets new puzzles. Pick a cover color and layout for the series on the form, so its covers stand apart from other people’s. Number fill in also goes into a variety book with other kinds.
What goes in the listing?
listing.txt in the ZIP has a title, subtitle, description, seven keyword ideas and the print options to pick on KDP. The preview folder has six images of real pages for your listing.
Also: fill in books · number search books · kakuro books · sudoku books · large print puzzle books · variety books