This collection of over 200 sudoku puzzles is published in association with The Turing Trust. Inspired the legacy of the brilliant World War II codebreaker Alan Turing, these puzzles designed to present a tough challenge. They are divided into three levels of difficulty, the final of which is for true experts.This puzzle book includes a foreword written by Sir Dermot Turing, nephew of Alan Turing and trustee of Bletchley Park, the former British codebreaking HQ where Alan Turing worked. Its retro 1940s cover is reminiscent of wartime book designs and makes a wonderful gift. Set your mind to work and see whether you have the skills to become a Bletchley Park number cruncher. ABOUT THE SERIES: The Turing Tests are a series of innovative puzzle books, inspired by the ingenious problem-solving skills of World War II codebreaker Alan Turing. Each title includes a variety of compelling puzzle types designed to challenge and stretch your mind. Do you have what it takes to solve them all?