Puzzle Detail
Classic Mathdoku Classic 9×9 Hard — Set 18
| 8= | 6= | 1= | 3= | 9= | 70x | |||
| 7+ | 120x | 4+ | 8= | |||||
| 23+ | 17+ | 216x | ||||||
| 6= | 7= | 504x | 4= | 10+ | ||||
| 9= | 15+ | 17+ | 1 | |||||
| 240x | 162x2 | 3= | 1= | 4= | ||||
| 7 | 26+ | 1= | 11+ | |||||
| 8- | 3 | 15+ | 3/ | 5= | ||||
| 3= | 15+ | 448x | 9= | 7= |
Show solution
| 8 | 6 | 4 | 1 | 3 | 9 | 5 | 7 | 2 |
| 4 | 2 | 6 | 5 | 1 | 3 | 7 | 8 | 9 |
| 1 | 7 | 5 | 2 | 6 | 4 | 9 | 3 | 8 |
| 6 | 9 | 2 | 7 | 5 | 1 | 8 | 4 | 3 |
| 2 | 3 | 9 | 8 | 7 | 5 | 4 | 6 | 1 |
| 5 | 8 | 7 | 9 | 2 | 6 | 3 | 1 | 4 |
| 7 | 4 | 8 | 3 | 9 | 2 | 1 | 5 | 6 |
| 9 | 1 | 3 | 4 | 8 | 7 | 6 | 2 | 5 |
| 3 | 5 | 1 | 6 | 4 | 8 | 2 | 9 | 7 |
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.