The ideal gift for royal fans.
This is the story of a life dedicated to public service, reported by The Times as
This sixth & toughest addition to the successful Times Killer Su Doku series will test your skills to the limit, adding the challenge of arithmetic & taking Su Doku to a new & even deadlier level of difficulty. The puzzles use the same 9x 9 grid as Su Doku but with an added mathematical challenge. The aim is not only to complete every row, column & 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 & Deadly Killer Su Doku puzzles, there is no chance to ease yourself in with easy puzzles. For those who like to live dangerously & push beyond their mental comfort zone, steel yourself for The Times' toughest collection yet.