Su Doku Silver is the second title in a new series of books from the Su Doku master Wayne Gould. Continue the race to master Su Doku at every level with this Mild collection of puzzles guaranteed to entertain & challenge you at a relaxed pace. The original creator of The Times puzzles Wayne Gould is the leading authority on Su Doku & is the man responsible for transforming this Japanese number puzzle into a worldwide phenomenon. Goulds success resulted in him being listed as one of Time magazines most influential people in 2005. Containing 150 previously unpublished puzzles Su Doku Silver follows on from Su Doku Bronze & is the second of four collections designed to exercise the brain & test your logic.