Make a free printable sudoku (and turn it into a book)

To make a free printable sudoku, open the free sudoku generator→, pick a difficulty, and press generate. You get a printable board with exactly one solution, plus its answer page, with no sign-up and no watermark. Print it from your browser and you're done. That's genuinely all it takes for a single puzzle. The more useful thing to know is what turns one printable board into a shelf of books you can sell, and that's a single step, covered at the end.

Make one now, in the browser

The free generator→ is the whole tool, not a teaser.

• Pick a difficulty, from gentle to hard.
• Press generate. You get a fresh 9 by 9 board with exactly one solution.
• Print the puzzle, and print or keep the separate solution page.

There's no account, no email, and no watermark stamped across the grid. It's handy for a classroom warm-up, a quiet afternoon, or just seeing what a large-print board looks like before you commit to anything bigger.

Why single-solution matters even for one puzzle

A sudoku with two valid answers, or none, isn't a sudoku. It's the flaw that turns a solver off a whole book, and it's invisible until someone gets stuck. Every board the generator makes is checked by a solver to have exactly one solution before it hands you the file, so the free printable you print is a real, solvable puzzle, and the answer page is the one and only answer for that grid.

That single-solution guarantee is the same promise the paid studio keeps at scale, which is what makes the jump from one puzzle to a book a matter of quantity, not quality.

The one step that turns a puzzle into a book

A printable is one board. A book is a graded set of them, laid out for print with a matching solutions section, sized to a KDP trim that passes review. That's the step, and it's the whole reason a low-content book is a product rather than a printout.

The KDP sudoku maker does that step for you. It generates hundreds of boards across a difficulty curve, checks each one for a single solution, builds the numbered solutions section at the back, and exports a 300 DPI print-ready interior at the trim you choose. You unlock a project once for $4.99 and export it as many times as you like, so you can produce a large-print and a standard edition from the same generation. Before it hands over the files, it runs a preflight check against your chosen trim and refuses an export KDP would reject.

From one printable to a catalogue

Start with a single free board to see the output. Pick a specific level and audience, such as easy large-print sudoku for beginners or a hard set for enthusiasts. Generate around 120 graded puzzles in the studio, export the interior, add a plain cover, and upload. Then do the next level. The earning comes from a shelf of focused books, each clearly for one reader. The full path, from picking a niche to setting up the listing, is in how to make and sell sudoku books on KDP, and the exact page geometry is in the sudoku interior specs.