Is this expert sudoku free to print?

Yes. Generate the puzzle above and print it with its solution, at no cost and with no sign-up. It is free for classroom, home and personal use.

Does every expert sudoku board have one solution?

Yes. Every board is generated and verified to have exactly one solution, so a puzzle is never ambiguous or unsolvable. The full solution prints on the second page.

Can I make a sudoku book to sell on KDP?

Yes. The free tool makes one puzzle. The KDP sudoku maker generates hundreds of graded puzzles at any KDP trim, as a print-ready 300 DPI interior and solutions PDF, so you can publish a book.

Free printable

Expert sudoku

Expert sudoku, which our generator calls extreme, is for solvers who want to work for it, with only around 27 starting numbers. Despite the challenge, every board has exactly one solution, so it always resolves with careful logic. The answer key prints with each puzzle.

Grid size

9×9 is standard. 4×4 and 6×6 are kids sudoku, easier and quicker to solve.

Difficulty

Higher grades need harder solving techniques, not just fewer given numbers.

28 given numbers

Hardest step to solve: Naked and hidden pairs

Layout

Symmetric gives the classic newspaper look.

Two pages: the puzzle and its solution. Every board has exactly one solution, generated by the same engine as our KDP studio.

Want the whole book?

This makes one puzzle. Sign up to turn it into a full sudoku book for Amazon KDP: hundreds of graded puzzles at any trim, as print-ready PDFs. We carry your difficulty into the studio.

Build the full book

Free to build · pay once to export

Preview

The puzzle and its solution, as they print.

Sudoku Extreme

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Sudoku Extreme · Solution

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How to solve a sudoku

Every grid has exactly one answer, and you reach it by logic alone. A well-made sudoku never needs a guess.

The method

1Look for the only number that fits. Scan each row, column and box for a square where every other number already appears somewhere it can see. The one number left is the answer for that square.
2Pencil in the candidates. In a square with a few numbers still open, note them small in the corner. As you fill its neighbours, cross the used numbers off until one remains.
3Work one box at a time. A number appears once in every box. If two of a box rows or columns are already blocked for a number, the third holds it.
4Check as you go. No number repeats in any row, column or box. If one does, a recent mark was wrong, so rub it out and try the next deduction.

The one rule: Fill the grid so every row, every column and every box holds 1 to 9, each exactly once.
What the answer page shows: Every solved grid is printed at the back, so you can check a single square or the whole puzzle.
How the grades differ: Easy puzzles solve on single numbers alone. Harder grades ask for candidate marks and longer chains of reasoning, never a guess.
Good for: Beginners learning the moves, and regulars who want a graded run from gentle to brutal.

Making a whole sudoku book?

This page makes one puzzle. To publish a book on Amazon KDP, the KDP sudoku maker generates hundreds of graded puzzles at any trim, as a print-ready 300 DPI interior and solutions PDF. Generate once, export unlimited sizes.

More printable sudoku

See every printable sudoku

Questions

Is this expert sudoku free to print?: Yes. Generate the puzzle above and print it with its solution, at no cost and with no sign-up. It is free for classroom, home and personal use.
Does every expert sudoku board have one solution?: Yes. Every board is generated and verified to have exactly one solution, so a puzzle is never ambiguous or unsolvable. The full solution prints on the second page.
Can I make a sudoku book to sell on KDP?: Yes. The free tool makes one puzzle. The KDP sudoku maker generates hundreds of graded puzzles at any KDP trim, as a print-ready 300 DPI interior and solutions PDF, so you can publish a book.