If Sudoku is difficult, just wait to try Killer Sudoku. The next step up from normal Sudoku, the Killer puzzles use the same grid as Sudoku and require the reader to fill in the numbers one to nine as before. But this time the numbers in the outlined boxes must also all add up to a specific number. Already hugely popular in the national press, the puzzles are a must for Sudoku fans. With five difficulty ratings, from very easy to deadly, the 100 brand-new Killer Sudoku puzzles in this book will provide a challenge to the most ardent Sudoku addict.
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