Puzzle Detail
Classic Mathdoku Classic 9×9 Hard — Set 4
| 15+ | 42x | 5= | 7- | 54x | ||||
| 5x | 72x1 | 672x7 | 2- | |||||
| 4= | 12+ | |||||||
| 210x | 9= | 2= | 1- | 10+ | ||||
| 14+ | 1= | 126x | 5= | |||||
| 13+ | 18+ | 24+ | ||||||
| 22+ | 4= | 18+ | 9= | 1= | ||||
| 84x7 | 6= | 9+ | 9 | |||||
| 16x | 6x | 27+ | 5= |
Show solution
| 4 | 2 | 3 | 7 | 5 | 8 | 1 | 6 | 9 |
| 5 | 9 | 1 | 2 | 7 | 4 | 8 | 3 | 6 |
| 1 | 5 | 9 | 4 | 8 | 3 | 6 | 2 | 7 |
| 7 | 6 | 8 | 9 | 2 | 5 | 4 | 1 | 3 |
| 6 | 8 | 7 | 1 | 3 | 9 | 2 | 5 | 4 |
| 9 | 1 | 5 | 3 | 6 | 2 | 7 | 4 | 8 |
| 2 | 3 | 4 | 6 | 9 | 7 | 5 | 8 | 1 |
| 8 | 7 | 6 | 5 | 4 | 1 | 3 | 9 | 2 |
| 3 | 4 | 2 | 8 | 1 | 6 | 9 | 7 | 5 |
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.