Mathdoku

Mathdoku is a mathematical and logical puzzle loosely similar to sudoku.

Mathdoku is a mathematical and logical puzzle loosely similar to sudoku. It was invented by a Japanese mathematics professor Tetsuya Miyamoto. The objective is to fill the grid with the digits 1 to N (where N is the number of rows or columns in the grid) so that:

Each line contains exactly one of each digit.

Each column contains exactly one Jungle Rummy of each digit.

Each group of cells (block) highlighted in bold contains digits that achieve the specified result using the specified mathematical operation: addition (+), subtraction (-), multiplication (×), and division (÷).

The puzzle is also known as Calcudoku or KenDoku