This ninth instalment of the best-selling Times Su Doku series to feed the nation's desire for yet more Su Doku puzzles. Su Doku is the biggest craze to hit The Times since the first crossword was published in 1930. From obscure origins, the wordless puzzle is now the hottest challenge to readers of The Times and has generated huge interest. The Times Su Doku Book 9 contains 150 mind-bending variations ranging from mercifully Mild to the uber challenging Super fiendish: 20 Mild puzzles 50 Difficult puzzles 50 Fiendish puzzles 30 Super fiendish The Times continue to offer superior Su Doku puzzles from their suppliers, Sudoku Syndication, that will put your logic to the ultimate test.