Revenge of Killer Sudoku 4 : 150 of All New Puzzles, Paperback by Ape, D. J., ISBN 1441400958, ISBN-13 9781441400956, Like New Used, Free P&P in the UK

4th book in the series, with all NEW puzzles in the same format and same difficulties! Another sequel in the Killer Sudoku series of books from DJAPE. Brand new puzzles, with the same intensity and intricacy as the old ones. There are no trivial puzzles in this book - the accent is again on moderate and difficult puzzles. Contents:

• 100 Killer Sudoku
• 10 Killer Sudoku with diagonal cages
• 30 ZERO Killer Sudoku (blank cages) and for the first time...
• 10 Killer TriDoku

This is certainly the bloodiest Killer Sudoku book you'll ever find!