Sudoku is a logic-based number puzzle that does not involve arithmetic. Although first published in an American puzzle magazine in 1979, Sudoku gained popularity in Japan in 1986 before becoming an international craze in 2005. The goal is to enter a numer
British journalist Paul Stephens explains the Sudoku-solving techniques of crosshatching (eliminating rows and columns), slicing and dicing (a different way to look at crosshatching), and penciling in.
Japanese puzzle magazine Nikoli divides their Sudoku lessons into twelve classes.
This eleven-page free PDF ebook from Michael Mepham of the Daily Telegraph requires the free Adobe Reader.
This four-page tutorial from Pappocom makes extensive use of mouseovers.
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