GCHQ is a top-secret intelligence and security agency which recruits
some of the very brightest minds. Over the years, their codebreakers
have helped keep England safe, from the Bletchley Park breakthroughs of
WWII to the modern-day threat of cyberattack. So it comes as no surprise
that, even in their time off, the staff at GCHQ love a good puzzle.
Whether they're recruiting new staff or challenging each other to the
toughest Christmas quizzes and treasure hunts imaginable, puzzles are at
the heart of what GCHQ does. Now they're opening up their archives of
decades' worth of codes, puzzles and challenges for everyone to try. In
this book you will find tips on how to get into the mindset of a
codebreaker, and puzzles ranging in difficulty from easy to
brain-bending.