For those who like to live dangerously & push beyond their mental comfort zone steel yourself for the second book in The Times' toughest Killer series yet Prepare for the extreme mental challenge of 100 Deadly-level Killer puzzles including exclusive to The Times 20 Extra Deadly to really test your limits this is the only series in which you'll find such a torturous collection The Times Ultimate Killer Su Doku 2 is not for the fainthearted The puzzles use the same 9x 9 grid as Su Doku & have 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 If the first Ultimate Killer Su Doku didn't scare you off
- see how you fare after tackling this one