If you thought Sudoku was difficult, wait until you try Killer Sudoku! The next step up from normal Sudoku, the Killer puzzles use the same grid as Sudoku & require the reader to fill in the numbers 1 to 9 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.