The Times Su Doku - The Times Fiendish Su Doku Book 18: 200 Challenging Su Doku PuzzlesYou dont need to be a mathematical genius to solve the treacherous puzzles in this collection of Fiendishly difficult puzzles its simply a question of logic. Perfect for the advanced solver in need of a constant supply of ultra difficult puzzles, and guaranteed to provide hours of mind stretching entertainment.
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The Times Su Doku - The Times Fiendish Su Doku Book 18: 200 Challenging Su Doku Puzzles