The Times Killer Su Doku, Book 6: The Dangerously Addictive Su Doku Puzzle

This sixth and toughest addition to the successful Times Killer Su Doku series will test your skills to the limit, adding the challenge of arithmetic and taking Su Doku to a new and even deadlier level of difficulty.

The puzzles use the same 9x9 grid as Su Doku but with an added mathematical challenge. The aim is not only to complete every row, column and cube so that it contains the digits 1-9, it is also necessary to ensure that the outlined cubes add up to the same number as well.

With 150 new Tough and Deadly Killer Su Doku puzzles, there is no chance to ease yourself in with easy puzzles. For those who like to live dangerously and push beyond their mental comfort zone, steel yourself for The Times' toughest collection yet.

About the Author:

Times Mind Games brings together the very best puzzles from the pages of The Times: Cryptic and General Knowledge Crosswords, Jumbo Crosswords, Codewords, all levels of Su Doku and mixed number puzzles and word-based games and quizzes.