A fresh, valid puzzle every time you click.
Free Printable Sudoku
A fresh puzzle with exactly one solution, easy to expert, with the answer key on the next page.
This is the PrintNook page, not the printable sheet.
To print the sheet at its true size, go back and use the Print or Download PDF button, then print at 100 percent scale, not Fit to page.
Free for personal and commercial use, solutions included. Print at 100 percent scale, not Fit to page.
Free for personal and commercial use. No attribution required, no watermark. See terms.
Want to generate a batch at a different difficulty? Open it in the sudoku generator.
Sudoku is the number placement puzzle where every row, column, and three by three box must contain the digits one through nine exactly once. PrintNook generates a brand new, fully valid puzzle each time, then lets you download it as a clean PDF with the solution on a second page. Choose a difficulty from easy to expert, print a stack for the train or the classroom, and never buy another puzzle book.
What printable sudoku is good for
Daily brain training
A puzzle a day keeps logical reasoning sharp. Easy grids warm you up; expert grids demand careful chains of deduction.
Classroom activities
Print a set at graded difficulties for early finishers or logic lessons. Each sheet includes an answer key for quick checking.
Screen free downtime
Keep a few printed puzzles in a bag for waiting rooms, flights, and quiet evenings away from a phone.
Which difficulty to print, and what the levels actually change
The only thing the difficulty changes is how many starting clues are left on the board, and that changes the kind of thinking required rather than the amount. Easy grids can be solved almost entirely by scanning: look at a row, find the one place a digit can go, move on. Medium starts to need elimination within a box. Hard and expert need you to hold a chain of two or three deductions in your head, or to pencil in candidates. If you are printing for a class or a group, print a spread rather than one level: nothing kills a puzzle sheet faster than half the room finishing in two minutes and the other half not starting.
Specifications
Counted from the generator itself at its default settings, not estimated. Change a setting and these numbers change with it. How we measure explains where they come from.
| Measure | A4 | US Letter |
|---|---|---|
| Sheet size (portrait) | 210 x 297 mm (8.27 in x 11.69 in) | 215.9 x 279.4 mm (8.50 in x 11.00 in) |
| Page margin | 20 mm | 20 mm |
| Grid | 9 x 9 cells | 9 x 9 cells |
| Cell size | 18.89 mm | 19.54 mm |
| Grid width | 170 mm | 175.9 mm |
| Line weights (cell, box) | 0.2 / 0.7 mm | 0.2 / 0.7 mm |
| Solution | Included, on a following page | Included, on a following page |
Print at 100 percent. Turn off Fit to page in your print dialog so the layout keeps its true measurements. See our print settings guide for the full checklist, or A4 versus Letter if you are unsure which size to pick.
Frequently asked questions
Are the puzzles guaranteed to be solvable?
Yes. Every puzzle is built from a complete, valid solution grid, so each one can be finished with logic alone. The solution is included on the second page.
How do the difficulty levels differ?
Harder levels reveal fewer starting numbers and require longer chains of reasoning. Easy grids give more clues so beginners can build momentum.
Are the puzzles guaranteed to have exactly one solution?
Yes. Clues are removed from a complete grid only while the puzzle still has a single answer, so every printed puzzle can be finished by logic without ever guessing.
Where is the answer key?
On the page after the puzzles. Printing double sided keeps the answer off the sheet you are working on, which is worth doing if you are handing them out.
Do I get the same puzzle twice?
Practically never. Each grid is built fresh in your browser rather than picked from a stored list, and nothing is remembered between visits.
Does A4 or Letter change the grid?
Only its size. The grid is a square inset 20 mm from the page edges, so on the wider Letter sheet each cell is about half a millimetre bigger.
Can I put these in a newsletter or a school pack?
Yes, for anything. The PDFs are free for personal, classroom and commercial use, with no attribution required and no watermark anywhere on the page.
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