Tease Your Brain: 11 Puzzles To Sharpen The Mind.
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The GCHQ Puzzle Books I And II – If you like crosswords, difficult riddles, secret codes or complex challenges, don’t miss this two-volume set of puzzle books by Britain’s secretive intelligence organisation GCHQ. Not for the faint of heart, the puzzles contained in volumes 1 and 2 are brain-bending and excruciatingly difficult, but not impossible to crack, having been put together by some of Britain’s best cryptographers and code breakers. What’s inside? Shapes, Wordgrid, I Spy, Sort Out The Characters, Word Hunting, Sudoku, Countdown, Cryptic Crosswords and even a GCHQ Puzzle Book Competition.