Christmas code-crackers: GCHQ reveals annual festive card for puzzle fans

Seven brainteasers feature in intelligence agency’s 2025 Christmas card, with covers designed by UK school pupilsA warning from the spies at GCHQ: a robber is on the loose, intent on stealing Christmas presents. Luckily, he won’t find it easy.The robber’s target, according to the British intelligence and security agency, is a house with a large number of rooms, each of which has a letter, which are linked to each other by coloured doors and arrows. He can’t go through the same-coloured door twice in a row, and can’t move against any arrows. Eventually, the robber is caught by the police. How was he acting? Continue reading...