About 9×9 Medium Sudoku

The classic 9×9 Sudoku — 81 cells, numbers 1–9, nine 3×3 boxes. The most played format worldwide.

At Medium difficulty, 40% of the 81 cells are pre-filled, leaving 48 cells for you to solve. A satisfying challenge for most players.

Tip: Scan each row, column, and box for numbers that can only go in one place.

Other difficulty levels for 9×9

How many medium 9×9 Sudoku puzzles are available?

Unlimited. Every time you click "New Game" a brand-new algorithmically generated puzzle is created. You will never run out of puzzles.

Are these puzzles printable?

Yes! Visit our printable Sudoku page to generate 4 puzzles per page as a PDF. Free, no login needed.

What solving techniques does Medium difficulty require?

Naked singles, hidden singles, and some elimination techniques.

Free, instant, no login — works on mobile, tablet and desktop.