Puzzle Detail
Classic Mathdoku Classic 9×9 Medium — Set 21
| 9= | 8= | 1=1 | 54x | 56x | 6= | 5= | ||
| 19+ | 8x | 60x5 | 14+ | 1= | ||||
| 6= | 4- | 8=8 | 8+ | 9= | ||||
| 6=6 | 20+ | 7= | 2=2 | 4 | ||||
| 9+ | 4 | 8 | 18x6 | 9= | 18x | 28x | ||
| 1 | 1- | 7= | 1- | 16+ | ||||
| 9+ | 8= | 1= | 17+ | |||||
| 6+ | 441x | 1= | 4= | 4- | 8= | |||
| 6= | 45x9 | 8=8 | 1= | 15+ | 4= | 2= |
Show solution
| 9 | 8 | 1 | 3 | 2 | 7 | 4 | 6 | 5 |
| 4 | 2 | 6 | 5 | 9 | 8 | 3 | 7 | 1 |
| 7 | 1 | 4 | 2 | 6 | 5 | 8 | 3 | 9 |
| 8 | 6 | 3 | 9 | 7 | 1 | 2 | 5 | 4 |
| 5 | 4 | 8 | 6 | 3 | 9 | 1 | 2 | 7 |
| 1 | 3 | 2 | 7 | 5 | 4 | 6 | 9 | 8 |
| 2 | 7 | 5 | 4 | 8 | 6 | 9 | 1 | 3 |
| 3 | 9 | 7 | 1 | 4 | 2 | 5 | 8 | 6 |
| 6 | 5 | 9 | 8 | 1 | 3 | 7 | 4 | 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.