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Sudoku for the brave of heart! Sharp-minded solvers willing to venture into dangerous puzzle territory will find satisfaction navigating these killer sudoku. Each one looks like a regular sudoku, but with a challenging twist: there are also additional boxes surrounding sets of squares. Those boxes contain tiny numbers that tell you the sum of the digits inside the box. It's a brain-stretching variation that will delight sudoku fans everywhere.
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Book Description Puzzlewright, 2010. Condition: New. book. Seller Inventory # M140277186X