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Calcudoku 7x7 156 Hard Kenken Puzzles with Solutions Volume n°8 - Les Puzzles Malins Editions / Les Editions Neurones Malins Calcudoku (also known as "KenKen", "KENKEN", "KenDoku", "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 the specified result using the specified mathematical operation: addition (+), subtraction (-), multiplication (×), and division (÷). Unlike Killer Sudoku, digits may repeat within a block. What will you find in this book? 156 Hard Kenken puzzles Solutions included Glossy cover