The Times Su Doku Book 14Paperback, 1 August 2014

150 mind-bending variations that range from mercifully mild to the uber-challenging super fiendishThe 14th installment of the "Times" Su Doku serieswill feed puzzlers' 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 has generated huge interest.This collection contains 10 Mild puzzles, 60 Difficult puzzles, 50 Fiendish puzzles, and 30 Super fiendish, to put your logic to the ultimate test."