The Turing Tests Expert Super Sudoku: Eric Saunders

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.