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5. Crosswords were banned in Paris during World War II in case they were used to pass secret messages to the enemy. In fact, in 1944, allied security officers thought journalists were sharing top secret information when a series of Telegraph crosswords included secret code words for military operations. Investigators later concluded that the incident was nothing more than a coincidence. However, Britain’s central decryption establishment, Bletchley Park, asked its cryptologists to solve a Daily Telegraph crossword in less than 12 minutes as part of its recruitment process