New York Post Train Your Brain Su Doku: Difficult (Paperback)
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The official utterly addictive number-placing puzzle
Give your brain a workout with these all new Difficult-level puzzles. Their addictive power will not only entertain—Su Doku puzzles engage your mind, improve your concentration, and help you stay mentally fit. There's no excuse for slow thinking and flabby wits when you can train your brain!
Beware of pale imitations. These are the original and official Su Doku puzzles by Wayne Gould—New York Post's Su Doku puzzle master and one of Time magazine's Most Influential People.
About the Author
Wayne Gould is the brains behind Su Doku. A former High Court judge in Hong Kong, he now spends his time developing the puzzle.