Sudoku
4 posts on this topic.
17 October 2026 · 5 min read
Make a free printable sudoku (and turn it into a book)
Make and print a single sudoku free in your browser, no sign-up, then the one step that turns a puzzle into a graded book you can sell on KDP.
3 October 2026 · 6 min read
KDP sudoku interior specs: trims, margins and solutions
The trim sizes, margins, gutter, bleed and solutions layout a KDP sudoku interior needs to pass review, with the large-print grid numbers that sell.
1 October 2026 · 8 min read
How we make sure every sudoku has one solution
How our sudoku generator works: fill a grid, remove clues in pairs, and re-solve after every removal so each board has one answer. Real code and timings.
22 September 2026 · 8 min read
How to make and sell sudoku books on Amazon KDP
A practical 2026 guide to making sudoku books for Amazon KDP: a difficulty curve, single-solution grids, interior specs, a solutions section and upload.