Challenge yourself with number puzzles! The latest volume in the hugely popular Killer Su Doku series from The Times features the highest-quality puzzles with an extra element of arithmetic.

These puzzles 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 utilize 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 to contain the numbers 1-9, but it's also necessary to ensure that the outlined cubes add up to the same number as well.

With 200 new Moderate, Tricky, Tough, and Deadly Killer Su Doku puzzles, there is no chance to ease yourself in with simple puzzles. For those who like to live dangerously and push beyond their mental comfort zone, brace yourself for The Times' next terribly tough installment.