Alan Turing is often called the father of modern computing. During World War II, he worked at Bletchley Park, where top secret work was carried out to decipher the military codes used by Germany and its allies. Turing played a pivotal role in cracking intercepted coded messages that enabled the Allies to defeat the Nazis in many crucial engagements, and his work was vital in helping the Allies win the war. Published in association with The Turing Trust, this challenging collection of sudoku puzzles will stretch, puzzle and entertain you for hours. Set your mind to work and see whether you have the skills to become a Bletchley Park number cruncher.