Number-place puzzles for every level
Number-place puzzles (best known by the name sudoku) ask you to fill a grid so every row, column and box contains each number exactly once. They are pure logic with no arithmetic, which makes them a favourite for classrooms, commutes and quiet evenings. This generator makes them fresh on demand rather than copying them from a book, so you can print as many as you like.
Smaller grids are where children start. A 4×4 puzzle uses the numbers 1–4 in 2×2 boxes and suits ages 5–7. 6×6 uses 1–6 in 2×3 boxes and is a good bridge. The classic 9×9 grid uses 1–9 in 3×3 boxes.
How difficulty is decided (honestly)
Every puzzle is checked by a solver to have exactly one solution. That is non-negotiable. A puzzle with two answers is not a puzzle. Difficulty then comes from two things we can measure:
- Easy: more clues, and the puzzle can be finished just by finding cells where only one number fits.
- Medium: fewer clues; it also needs “this number can only go in one place in this row, column or box” reasoning.
- Hard: we remove as many clues as we can while keeping one solution. These usually need more advanced techniques, but we don’t grade them beyond that, so some hard puzzles are only moderately tough.
Printing and classroom tips
Print 1, 2 or 4 puzzles per page (up to 6 for 4×4), with solutions on separate pages and puzzles numbered so they match. Each puzzle shows its clue count. For a class, give everyone the same puzzle so you can discuss strategies, or press New puzzles between copies for variety. This tool is not affiliated with any puzzle publisher; "sudoku" is used here only as the common name of the puzzle type.
Questions people ask
Does every puzzle have a unique solution?
Yes. A solver checks every puzzle before you see it and keeps only puzzles with exactly one solution.
What’s the difference between easy, medium and hard?
Easy puzzles can be solved by finding cells with only one possible number. Medium needs “only place for this number” logic too. Hard has the fewest clues we can reach while keeping one solution.
Are 4×4 and 6×6 good for kids?
Yes. 4×4 is a great first puzzle for ages 5–7, and 6×6 is a good step before the full 9×9.
Can I print several puzzles on one page?
Yes, up to 4 per page for 6×6 and 9×9, or 6 for 4×4. Solutions print separately and are numbered to match.
Is this an official sudoku product?
No. It’s an independent, unofficial number-place generator. The puzzle name is used descriptively.
Why does generating 9×9 hard take a moment?
Each removal of a clue is double-checked for uniqueness, which takes a little computing. It still runs entirely in your browser.