Calcudoku Puzzle: The Best Mathematical Puzzles Collection (Calcudoku Puzzle Books)
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Calcudoku Puzzle: The Best Mathematical Puzzles Collection (Calcudoku Puzzle Books)
CalcuDoku 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 according specific rules.