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    By: Sunday Times The

    Date Released

    Out of Print

    The puzzles use the same 9x9 grid as normal Su Doku but with an added mathmatical 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.

    With 150 new Killer Su Doku puzzles, you can ease yourself in with the Moderate before taking the plunge and tackling the real killers:

    20 Moderate

    50 Tricky

    50 Tough

    30 Deadly

    For those who like to live dangerously and push beyond their mental comfort zone, steel yourself for The Times' toughest collection yet.

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