Test yourself with the official GCHQ Puzzle Book the perfect gift for anyone who loves a good headscratcherFiendish . . . as frustrating divisive and annoying as it is deeply fulfilling Guardian The secrets of the country depend on you.Find out if youve got what it takes to be a code breakerGCHQs topsecret codebreakers have always protected the country from Bletchley Parks warending WWII breakthroughs to saving us all from lifedestroying foreign cyberattacks.But what kind of mind does it take to work there And do you have the brain power cunning and resourcefulness to pit your wits against them and win Here taken from their archives are decades of codes puzzles and challenges for everyone to try.Youll discover Tips on how to get into the mindset of a codebreaker Puzzles ranging in difficulty from easy to brainbending Challenges that have never been solved Insight into the organisations top secret history dating back to 1919 The security of the country is at stake.What are you waiting for Get cracking ENJOY THESE TWO TEASERS What follows Vienna Brussels Prague Copenhagen Tallinn Helsinki Athens If 1000110 is MINGLE and 1000110001100 is APE what string of digits is POLITE Ideal for the crossword enthusiast Daily Telegraph