Calcudoku ("KenKen", "KENKEN", "KenDoku", "Mathdoku", "Square Wisdom") 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:
At some puzzles the signs of mathematical operations may absent (all signs or part of them). This makes the solving process more complicated.
Cross+A can solve and create puzzles from