The Times Su Doku - The Times Fiendish Su Doku Book 18: 200 Challenging Su Doku Puzzles

You don’t need to be a mathematical genius to solve the treacherous puzzles in this collection of Fiendishly difficult puzzles – it’s 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.