Did you do the GCHQ puzzle which was posted on the 17th September?
https://canyoufindit.co.uk/
As the competition is now closed, here is the worked solution by Prof Alan Woodward.
Did you do the GCHQ puzzle which was posted on the 17th September?
https://canyoufindit.co.uk/
As the competition is now closed, here is the worked solution by Prof Alan Woodward.