Extreme Su Doku: Bk. 1

The ultimate Su Doku challenge from Wayne Gould, the man who started it all. Wayne Gould is widely recognised as the leading authority on Su Doku. As the original creator of The Times puzzles, his books have been worldwide bestsellers, and he was listed as one of Time magazine's Most Influential People. In Extreme Su Doku, Wayne Gould presents his biggest challenge yet to every su doku addict, with 120 super-fiendish puzzles to test you to your limits.