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As you probably already know, sudoku is a type of puzzle that has recently attained enormous international popularity, most noticeably since last year. This game of logic, for both children and adults, has a growing presence in newspapers and magazines all over the world, as well as on the internet.

The simplicity of the rules, the different degrees of difficulty and the fact that it is a numerical game (and, therefore, not linked to any particular language) are some of the reasons that have been given to explain the popularity of sudoku. It has also been pointed out that it is a puzzle that is very fitting for the present day, when the culture of numbers is stronger than that of words: our culture is more numerical than alphabetical.

Sometimes, the word 'sudoku' is spelt 'Su Doku', a Japanese expression that can be translated as 'number single'. It was in fact in Japan that sudoku first took root and became strongest, although, contrary to what one might believe, it was not in Japan that it originates.