The brain-busting follow up from the UK's finest code-breakers and puzzle solvers at GCHQ. The spooks at GCHQ need your help again. Can you break these fiendish codes and prove you’re a master puzzler? The defence of the realm depends on GCHQ. And these fiendish puzzles and tests are how they test the best. Have you got what it takes in this second round of brain-bogglers? Inside you’ll find puzzles to develop: lateral thinking and ingenuity; kills to spot patterns; your ability to break ciphers; and a mindset to tackle authentic entrance tests. Keeping the country safe in secret since 1919, GCHQ is always on the look out for new recruits. Discover if you’ve got the kind of incredible, puzzle-solving mind to work there...