Train your brain with these fiendishly difficult puzzles, the perfect companion for anyone wanting to keep their mind busy
''Fiendishly tricky'' Daily Mail
With their first bestselling book, The GCHQ Puzzle Book, the UK''s intelligence and security experts tested us with puzzles, codes and real-life entrance tests from their archives.
Now, they are back with a NEW collection of head-scratching, mind-boggling and brain-bending puzzles that will leave you pondering for hours.
For those who often found themselves stumped with the first book, The GCHQ Puzzle Book 2 offers even more starter puzzles to get those brains warmed up. Puzzle aficionados needn''t worry though, as there is also an ''Even Harder'' section to test everyone to their limits . . .
Not only that, but in celebration of GCHQ''s centenary, the puzzles in this new book sit alongside stories, facts and photos from the organisation''s first
