Author: Gould, Wayne Sudoku & number puzzlesPublished on 3 April 2006 by HarperCollins Publishers (Times Books) in the United Kingdom as part of 'The Times Su Doku' series.Paperback | 320 pages196 x 128 x 21 | 214g Quiz your family at home with crosswords, puzzles and games. A collection of 200 Difficult Su Doku puzzles. Perfect for the more advanced Su Doku solver in need of a constant supply of challenging puzzles. Guaranteed to provide hours of absorbing, brain-stretching entertainment. Since the first Su Doku puzzle appeared in The Times in November 2004, they have become a phenomenon, with over 4 million copies of The Times Su Doku books sold worldwide. You don't need to be a mathematical genius to solve these puzzles; it is simply a question of logic. Each puzzle has a unique solution – and there's no guesswork required.The Times Su Doku remains the original, the best and the market leader. The puzzles are provided by Wayne Gould, the man who started it all.