Sudoku Magazine
In Killer Sudoku, sub-regions contain predefined sums, and no number can be
repeated within a region.
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Easy Killer Sudoku: 250 Sum Sudoku Puzzles for Adults
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Easy Killer Sudoku: 250 Sum Sudoku Puzzles for Adults
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Medium Killer Sudoku: 250 Sum Sudoku Puzzles for Adults
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101 Large-Print Killer Sudoku Puzzles Easy to Hard: One puzzle per page
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