Challenge, a seasonal greeting card that doubles as a set of fiendishly difficult puzzles, has been an annual tradition since 2015.

Plus, why CEOs should be paid like top footballers, the UK economy unexpectedly shrinks and Manchester mayor Andy Burnham on ...

If you always dreamt of being a spy, now is your chance to show off your detective skills. UK’s national security agency has ...

It is featured on a Christmas card sent by GCHQ’s director, Anne Keast-Butler. The card contains seven puzzles which range in ...

The annual brainteaser aims to tickle the neurons of those hoping to work in intelligence, and comes in the form of a ...

Challenge includes puzzles meant to engage young people in complex problem-solving. The aim is to inspire interest in STEM ...

GCHQ's annual brainteaser comes in the form of the agency's Christmas card, sent by the intelligence organisation's director ...