GCHQ Puzzle Book

Sharpen your mind to beat the smartest brains in Britain with the original official GCHQ puzzle book

Would GCHQ recruit you? Pit your wits against the people who cracked Enigma in the official puzzle book from Britain''s top secret intelligence and security organisation

Over the years, their codebreakers have helped keep our country safe, from the Bletchley Park breakthroughs of WWII to the modern-d...