How to print Sudoku puzzles

Printable Sudoku at a difficulty that means something, with a guarantee of a unique solution.

Generate puzzles for a newspaper-style page, a classroom, or a long journey, several to a sheet with answers on their own page.

Step-by-step

1. Choose a difficulty.
2. Choose how many puzzles per sheet.
3. Generate and print.

What the difficulty setting means

It is the hardest technique required, not the number of givens. Easy puzzles fall to scanning alone. Medium needs hidden singles. Hard requires pairs and pointing pairs. Expert needs an X-wing or similar.

This is more honest than counting clues. Clue count correlates only loosely with difficulty — a 26-clue puzzle solvable by scanning is easier than a 30-clue puzzle needing an X-wing — and grading by technique is why the ratings here behave consistently.

Unique solutions, always

Every puzzle is verified to have exactly one solution before it is offered. A puzzle with two cannot be solved by reasoning, only by choosing arbitrarily, and handing that to somebody is a waste of their afternoon.

Printing

Grids are sized for comfortable pencil work — enough room for candidate marks, which the harder levels require. Print in black and white; nothing depends on colour. Answers start a fresh page.

Frequently asked questions

Are these puzzles always solvable without guessing?

Yes. Each is verified to have a single solution reachable by the documented techniques.

What is the difference between hard and expert?

Hard needs pairs and pointing pairs. Expert needs a technique like an X-wing, where you reason about a digit's possible positions across two rows and two columns at once.

Can I print several to a page?

Yes, and answer keys are collected on their own page so a sheet can be handed out intact.