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In Japan, they don't do many crosswords. They do Su Doku instead. Thousands of puzzles are devoured in train carriages and waiting rooms every day. Yet, although the name is Japanese - roughly translating as ‘Number Place' – the puzzle itself, originally, may not be. A simpler version was created by Euler, the 18th-century Swiss mathematician, and today's Su Doku puzzle is thought to have evolved from that. All puzzles in this book were created by Wayne Gould, a puzzle enthusiast, and former Hong Kong judge. He came across Su Doku in a Tokyo bookshop, began making puzzles himself, and brought them to The Times.
Since the first puzzle appeared on the front cover of T2 on 12 November 2004, the daily back page Su Doku puzzle has become a phenomenon. Thousands enter the newspaper's competition each day and many readers have written in to say how much they enjoy the puzzles - including former Bletchley Park codebreakers who never miss a day, and computer enthusiasts who have created programmes to solve puzzles that they cannot.
Some readers, it is true, have been less delighted. Family feuds over who gets the back page at breakfast appear to have become commonplace.