Calcudoku - 120 Easy To Master Puzzles 6x6 - 9 (Calcudoku Puzzle Book 6x6)

Calcudoku (also known as "Mathdoku") is a mathematical and logical puzzle loosely similar to Sudoku.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 (-) .* Unlike Killer Sudoku, digits may repeat within a block.