Puzzle Detail
Classic Mathdoku Classic 9×9 Hard — Set 21
| 360x | 3= | 10+ | 6= | 18+ | ||||
| 7= | 4= | 2= | 1- | |||||
| 30x | 11+ | 25+ | 4= | 3= | ||||
| 7= | 5 | 10+ | 4= | 1= | ||||
| 1- | 18+ | 1- | 1= | 9= | 16x | 5= | ||
| 9= | 180x | 35x | 1= | |||||
| 24x | 1= | 4 | 5 | 22+ | ||||
| 12+9 | 336x | 96x | 5= | 4= | ||||
| 8= | 54x | 21+ | 3= |
Show solution
| 5 | 8 | 9 | 3 | 1 | 4 | 6 | 7 | 2 |
| 7 | 1 | 8 | 4 | 5 | 2 | 3 | 6 | 9 |
| 6 | 5 | 1 | 2 | 7 | 9 | 4 | 3 | 8 |
| 3 | 7 | 5 | 9 | 6 | 8 | 2 | 4 | 1 |
| 4 | 6 | 7 | 8 | 3 | 1 | 9 | 2 | 5 |
| 9 | 4 | 3 | 5 | 2 | 7 | 1 | 8 | 6 |
| 2 | 3 | 6 | 1 | 4 | 5 | 8 | 9 | 7 |
| 1 | 9 | 2 | 6 | 8 | 3 | 7 | 5 | 4 |
| 8 | 2 | 4 | 7 | 9 | 6 | 5 | 1 | 3 |
Solver Notes
Our classic mathdoku puzzles mix all four operations (addition, subtraction, multiplication, division) just like the original KenKen format.
What makes a mathdoku puzzle classic?
Classic mathdoku uses cages with any of the four arithmetic operations, matching the original KenKen-style puzzle format.
Are classic mathdoku puzzles good for beginners?
Start with the 4x4 classic grid — it's the easiest entry point into the full mathdoku experience.
Where can I print classic mathdoku?
Every puzzle page on Freemathdoku.com has a Print button that generates a clean PDF with the answer key.