The Times Killer Su Doku Book 21

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Author: The Times Mind GamesSudoku & number puzzles | Gift booksPublished on 22nd May 2025 by HarperCollins Publishers (Times Books) in the United Kingdom as part of 'The Times Su Doku' series.Paperback / softback | 288 pages 198mm x 130mm x 21mm | 198g Challenge yourself with number puzzles. 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. 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 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. 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 pushbeyond their mental comfort zone, steel yourself for The Times' next, terribly tough instalment. Show more