Calcudoku (also known as "Mathdoku") is a mathematical and logical puzzle loosely similar to Sudoku.It was invented by a Japanese mathematics teacher Tetsuya Miyamoto.The objective is to fill the grid in with the digits 1 through N (where N is the number of rows or columns in the grid) such that:• Each row contains exactly one of each digit.• Each column contains exactly one of each digit.• Each bold-outlined group of cells (block) contains digits which achieve the specified result using the specified mathematical operation: addition (+), subtraction (-), multiplication (×), and division(÷).• Unlike Killer Sudoku, digits may repeat within a block.