Killer Sudoku: The Lethally Addictive Sudoku Variantby Conceptis Puzzles
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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- 6.20(w) x 8.90(h) x 0.70(d)
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My absolute favorite killer sudoku book. I buy 2 or 3 at a time. Everything about it is just right...eevn the paper, the feel, etc.