The GCHQ Puzzle Book

A fiendish work, as frustrating, divisive and annoying as it is deeply fulfilling: the true spirit of Christmas

Guardian

Surely the trickiest puzzle book in years. Crack these fiendish problems and Trivial Pursuit should be a doddle

Daily Telegraph

Ideal for the crossword enthusiast

Daily Telegraph

An explosion of a puzzle collection, too, with hundreds of questions and loads of peripheral material, including captioned photographs and history of twentieth-century British encryption, featuring the work of Alan Turing

The Times Literary Supplement

WINNER OF STOCKING FILLER OF THE YEAR AWARD

THE GUARDIAN

This isn't your grandfather's Sudoku book. Rather, it's a puzzle compendium put together by the organisation that made the Bletchley Park breakthroughs - quizzes, bewilderments and brainteasers to challenge even the sharpest of minds

The Gentleman's Journal