Puzzle Detail
Classic Mathdoku Classic 9×9 Hard — Set 28
| 5= | 24x | 20+ | 2-7 | |||||
| 192x | 11+ | 8= | ||||||
| 2= | 6= | 20+ | 17+ | 8= | ||||
| 7= | 15+ | 7+ | 4= | |||||
| 504x | 7= | 17+ | ||||||
| 12x | 144x | 30x | 2/ | 17+ | ||||
| 13+ | 8= | 2= | 105x5 | 28+ | ||||
| 19+ | 4= | 7 | ||||||
| 21+ | 8/ | 2=2 |
Show solution
| 8 | 5 | 9 | 6 | 4 | 1 | 3 | 2 | 7 |
| 6 | 4 | 2 | 1 | 7 | 8 | 9 | 3 | 5 |
| 2 | 6 | 5 | 3 | 1 | 9 | 7 | 4 | 8 |
| 7 | 9 | 1 | 5 | 2 | 4 | 6 | 8 | 3 |
| 9 | 8 | 7 | 2 | 6 | 3 | 4 | 5 | 1 |
| 1 | 7 | 3 | 8 | 5 | 6 | 2 | 9 | 4 |
| 3 | 1 | 4 | 9 | 8 | 2 | 5 | 7 | 6 |
| 5 | 2 | 8 | 4 | 3 | 7 | 1 | 6 | 9 |
| 4 | 3 | 6 | 7 | 9 | 5 | 8 | 1 | 2 |
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.