Published in association with the Turing Trust, this challenging collection of more than 120 puzzles will put your number and logic skills to the test. Follow in the footsteps of famous World War II codebreaker Alan Turing who used impeccable logic to decipher the military codes used by Germany and its allies. These expert puzzles offer a tough but enjoyable challenge, with many variations of the popular number-placing puzzle sudoku. This book includes a foreword written by Sir Dermot Turing, nephew of Alan Turing and trustee of the former British codebreaking HQ, Bletchley Park. Sales of these books support the work of The Turing Trust, a charity set up by Alan Turing\'s family which provides much needed computers to schools in Africa. Product Information: • ISBN: 9781398808294 • Author: Eric Saunders, Sir John Dermot Turing  • Publisher: Arcturus • Format: Paperback • Pages: 160 • Dimensions: 23.3 x 15.3 x 1.6 cm