The GCHQ Puzzle Book: Perfect for anyone who likes a good headscratcher

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

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Odd word out

The themes in the following words are identical, but totally different! Which is the odd word out in each case?

a) ANGLE, BRING, CLAMP, DIRTY, EXACT, FIELD, GRASS, HEART, IMAGE, JAUNT
b) ABBEY, BURST, COURT, DRINK, ENJOY, FOUND, GIANT, HARMS, IDIOT, JUMPY

Identify Me

My first is in a combine harvester, but not in a ploughshare.
My second is in a pigsty, but not in a cowshed.
My third does not exist.
My whole is in a farmyard, but not in a jungle.
Identify me.

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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 our country 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
- Puzzles ranging in difficulty from easy to brain-bending
- A competition section where we search for Britain's smartest puzzler

Good luck!

'Fiendish . . . as frustrating, divisive and annoying as it is deeply fulfilling: the true spirit of Christmas' The Guardian

'Ideal for the crossword enthusiast' Daily Telegraph