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The eagerly-awaited fourth book in the bestselling Times Difficult Su Doku series.
A collection of 200 previously unpublished Difficult Su Doku puzzles – perfect for the intermediate Su Doku solver in need of a constant supply of challenging puzzles. You are guaranteed hours of absorbing, brain-stretching entertainment.
Since the first Su Doku puzzle appeared in The Times in November 2004, they have become a phenomenon, with over 5 million copies of The Times Su Doku books sold worldwide. You don't need to be a mathematical genius to solve these puzzles; it is simply a question of logic. Each puzzle has a unique solution – and there's no guesswork required.
The Times Su Doku remains the original, the best and the market leader.