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160 page 6.5x9 inch book containing 120 Sum Sudoku puzzles in easy, medium and hard difficulty levels.
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.