Calcudoku Rule
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.
Calcudoku Unlike Killer Sudoku, digits may repeat within a block.