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The new head of the intelligence agency, Anne Keast-Butler has set the 'trickiest Christmas Challenge so far' (pictured) for schoolchildren around the country.
GCHQ has unveiled its hardest ever Christmas puzzle, which needs a “mix of minds” to solve.
The puzzle will require friends, families and colleagues to work together - The Telegraph has solved it, can you?
The new head of the intelligence agency, Anne Keast-Butler set the 'trickiest Christmas Challenge so far' for schoolchildren around the country.
Last year's test challenged students to solve a series of seven puzzles, based on the Christmas tree image on the front of the card. There was also a twist to challenge older pupils in lateral thinking.