The Times Killer Su Doku Book 1: 110 lethal Su Doku puzzles (The Times Su Doku)

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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 numbers 1-9, it is also necessary to ensure that the outlined cubes add up to the same number as well. Selected from The Times these puzzles will challenge the sharpest minds.  The latest volume in the hugely popular Killer Su Doku series from The Times, featuring the highest-quality puzzles with an extra element of arithmetic. A bumper collection of easy, medium and difficult Su Doku puzzles to test your mental dexterity, powers of logic and deduction. Puzzles in this collection are taken from Times Ultimate Killer Su Doku Books 5, 6 and 7. Solutions easily found at the back of the book.