This seventh and toughest addition to the successful Times Killer Su Doku series 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.
Here are another 150 puzzles from Ireland’s favourite crossword <br/> The Simplex crossword is one of the most popular items in The Irish Times</em> with tens of thousands of readers attempting to solve it every day for over sixty years.
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