Puzzle Detail
Classic Mathdoku Classic 8×8 Hard — Set 21
| 30x | 1 | 112x | 18x | ||||
| 15+ | 7+ | 15+ | |||||
| 1- | 21+ | ||||||
| 4= | 3x | 480x | 60x | ||||
| 17+ | 5- | 13+ | |||||
| 144x | 12+ | 7= | 4- | ||||
| 7+ | 13+ | ||||||
| 2-3 | 588x | 6 | 11+ |
Show solution
| 5 | 4 | 2 | 1 | 7 | 8 | 3 | 6 |
| 6 | 7 | 4 | 8 | 5 | 2 | 1 | 3 |
| 2 | 1 | 3 | 5 | 8 | 6 | 7 | 4 |
| 4 | 8 | 1 | 6 | 2 | 3 | 5 | 7 |
| 7 | 2 | 8 | 3 | 4 | 1 | 6 | 5 |
| 1 | 6 | 5 | 4 | 3 | 7 | 2 | 8 |
| 8 | 3 | 6 | 7 | 1 | 5 | 4 | 2 |
| 3 | 5 | 7 | 2 | 6 | 4 | 8 | 1 |
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.