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Printable medium Sudoku puzzles
Around 36 givens — the level where scanning gets you a good way in and then stalls, and where you will want room in the margins. Two per page, answers on their own sheet.
Difficulty
Puzzles per page
Pages — 2 puzzles
Paper size
Answer key
Sheet title
Choose “Save as PDF” as the destination in the print dialog to keep a copy. Answers print on their own sheet at the end, so you can hand out the puzzles without them.
Leave room for pencil marks
Medium is the first level where you will genuinely want to note candidates, and paper is unforgiving about it — there is no notes mode and no undo. One or two puzzles per page keeps the cells big enough to write three or four small digits into without the grid turning illegible.
A pencil rather than a pen is not a small point at this level. Roughly one medium board in three will involve a candidate you have to take back.
Print a batch, keep the key
The answer sheet prints last, so you can separate it and keep it somewhere else — which is the whole reason it is on its own page rather than beside each puzzle. If you lose it, the solver will reconstruct any board from the givens.
Nothing is uploaded, and there is nothing to sign up for
The puzzles are generated in your browser the moment you open the page, and printing uses your own print dialog. There is no download endpoint, no email wall and no watermark. Hit New sheet as many times as you want — every press is a different set of boards.
Every puzzle has exactly one solution
Cells are removed one at a time and any removal that would leave the grid with two valid answers is put back. That matters more on paper than on screen: there is no undo on a printed sheet, so a puzzle that turns out to have two answers wastes the whole solve. The answer key on the second page is the real solution, not one of several.
Frequently asked questions
What makes these medium rather than easy?
Around 36 givens instead of 45. The boards open the same way, but partway through no single row, column or box forces a digit on its own and you have to combine two of them — which is where pencil marks stop being optional.
Should I use a pen or a pencil?
A pencil. Roughly one medium board in three involves a candidate you will want to take back, and paper has no undo.
How many should I print per page?
One or two. The cells need to be big enough to write three or four small candidate digits into without the grid becoming unreadable.
What if I lose the answer sheet?
Type the givens into the solver and it will reconstruct the board. Every puzzle here has exactly one solution, so what it gives back is the answer rather than an answer.
Keep reading
Or play without the printer
The same generator runs a full board in your browser, and Action Sudoku puts a real opponent on it. Free on iOS and Android.