GridbinderGridbinder · Sudoku
Sudoku puzzle book maker for KDP and e-ink
You publish Sudoku books, or want to, and you need up to a few hundred clean grids, different in each book you make. Pick Easy, Medium, Hard, Challenge or a progressive book, choose the trim size, and Gridbinder lays out the whole interior.
You get one PDF with a title page, how-to pages, the puzzles, an answer key and a Verification report at the back. A free sample of 12 puzzles, with a watermark, needs no account, so you can check the print size before you pay.
12 puzzles with your settings, watermarked, no account. Full books from $9 a month.
Why the proof matters here
A Sudoku with two valid solutions is the page a reader notices: they finish the grid, turn to the answer key, and find their correct grid marked wrong. A Sudoku that can only be finished by a blind guess is just as bad, because the reader gets stuck and blames the book. Gridbinder runs a complete search for a second solution and throws the puzzle away if it finds one, then requires a step-by-step solver that uses only rules a person can apply to finish it too.
Books end with a Verification report (on unless you switch it off): each puzzle with its level and size, the number of solutions a complete search found, and, for every type with a step-by-step solver, how it finished the puzzle.
Book ideas: A large print Sudoku book for seniors, one grid per page; A progressive book that starts at Easy and ends at Challenge; A 100-puzzle Medium book for people who solve on the train.
How to solve, as printed in the book
Fill the grid so that every row, every column and every 3 x 3 box contains each number from 1 to 9 exactly once.
The bold numbers are given. Every puzzle has exactly one solution and can be solved by logic alone.
| Easy | 9 x 9 |
|---|---|
| Medium | 9 x 9 |
| Hard | 9 x 9 |
| Challenge | 9 x 9 |
Questions
What grid size does Gridbinder use for Sudoku?
All four levels use a 9 x 9 grid with 3 x 3 boxes. The levels differ in how much logic a puzzle needs, not in size.
What makes Hard and Challenge harder?
Easy and Medium puzzles can be finished with direct deductions. Hard and Challenge may also need a one-step what-if check: try one value and follow the forced moves until they contradict. It is never a blind guess, and the Verification report shows how many steps and what-if checks each puzzle took.
Can I make a large print Sudoku book?
Yes. Switch on Large print for bigger type and choose one puzzle per page, so each grid fills the page. The KDP trim sizes are 6 x 9, 8 x 10, 8.5 x 11 and A4.
Other puzzle types
Killer Sudoku · Anti-Knight Sudoku · Nonogram · Slitherlink · Kakuro · Bridges · Masyu · Nurikabe · Star Battle · Number Paths · Word Search · E-ink tablet PDFs
See your own pages first
The free sample uses your settings and real puzzles. Check every page before you pay anything.
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