This book forms part of a series of puzzle books, produced by the Bletchley Park Trust. Follow in the footsteps of the Codebreakers and establish whether you have the puzzle-solving skills needed to have worked at wartime Bletchley Park. Other titles in the series are Logic Puzzles, Brain Training Puzzles, One Minute Puzzles, Codewords, Crosswords, Sudoku and Wordsearch.