KenKen (also known as "KENKEN", "KenDoku", "CalcuDoku", "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: 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 thespecified result using the specified mathematical operation: addition (+),subtraction (-), multiplication (×), and division (÷).-Unlike Killer Sudoku, digits may repeat within a block.
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