Sudoku maker
Make printable sudoku in 4 × 4, 6 × 6 or 9 × 9, easy, medium or hard, several to a page. Every puzzle has exactly one answer, and there is an answer key. Free, no sign-in.
To save a PDF, choose Print, then “Save as PDF” as the printer. Only the sheets print.
4 puzzles, 4 × 4, easy: 10 squares given of 16. Each has exactly one answer and can be solved without guessing.
How to use it
- Pick a grid. 4 × 4 uses the numbers 1 to 4 and is a first sudoku; 6 × 6 steps up; 9 × 9 is the classic.
- Pick a difficulty. It is set by how many squares are given: more squares given is easier.
- Choose how many puzzles you want and how many to put on a page. The preview and the print both follow.
- Press Print. The answer key pages come after the puzzles, with each answer in red. “Make another” gives a fresh set.
Ideas for class
- Early finishers: a folder of 4 × 4 puzzles that students can take from without asking.
- Logic warm-up: put one puzzle on the board for the first five minutes of math class and talk about how you know a square must be a 3.
- Teach the two moves: “this square has only one number that fits” and “this number has only one place left in its row, column or box”. Every puzzle here can be solved with just those.
- Homework for the weekend: a 6 × 6 and a 9 × 9, with the answer sheet posted on Monday.
- Differentiate: hand the same grid size out at two difficulties, since the sheets look alike.
- Brain break: four to a page, cut apart, one puzzle each for pairs to solve together.
Related
Questions
Does every puzzle really have one answer?
Yes. Each puzzle is built so that the squares left blank can all be worked out, one after another, by logic. That means the answer is forced, so there is only one. The tests for this tool check the number of solutions of puzzles at every size and difficulty.
Do students ever have to guess?
No. Every puzzle can be finished by two moves: a square that has only one number that fits, and a number that has only one place left in its row, column or box. No trial and error is needed.
What makes a sudoku Easy, Medium or Hard?
How many squares are given. For example a 9 × 9 gives 40 squares at Easy, about 32 at Medium and about 26 at Hard. A little more can be given when a board cannot lose more without becoming unsolvable by logic.
Why are the boxes in a 6 × 6 two squares high and three wide?
A 6 × 6 grid cannot be cut into square boxes, so the usual 2 × 3 boxes are used. A 4 × 4 has 2 × 2 boxes and a 9 × 9 has 3 × 3 boxes.
Can I get the same puzzles again?
Yes. The puzzles are made from a number printed at the foot of the sheet. Share copies a link with your settings and that number, so the same link gives the same puzzles and the same answers.
Is anything sent to you?
No. The puzzles are made in your browser, and your last settings stay on this computer only.
Nothing you do here is sent to us. Names, lists and settings stay in this browser. No sign-in, no ads.