Virgin Book of Killer Sudoku

If you thought Sudoku was difficult wait until you try Killer Sudoku! The next step up from normal Sudoku, these killer puzzles use the same grid as Sudoku and 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. 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.Virgin Books Staff, Books is the author of 'Virgin Book of Killer Sudoku ' with ISBN 9780753511589 and ISBN 0753511584.