Killer Sudoku

Start a clean, fast Sudoku puzzle on Math9. It is built for daily logic training, short puzzle breaks, and printable offline solving.

Killer Sudoku keeps the normal row, column, and box rules.
Each dashed cage must add up to the small sum shown in its corner.
Use notes and logical hints to combine Sudoku candidates with cage sums.

Killer Sudoku

FAQ

Is Math9 Sudoku free?

Yes. Math9 is free to play online and does not require registration.

Can I print a Sudoku puzzle?

Yes. Use the Print button to open a clean board-only print page.

Do hints reveal the answer?

Math9 hints focus on reasoning, candidates, and logical explanation rather than a bare answer.