Puzzles also helped Jacobs's parents keep in touch in 1964, during the time his father was stationed in Korea as a lawyer for the military and his mother was still in the U.S.

What's more, you'll find hundreds of crossword puzzles outside of the traditional newspapers in the form of digital and physical puzzle books, so you can always fulfill your need for more puzzles.

While the fourth-year engineering student has published hundreds of puzzles, the crown jewel is to get a crossword in the New York Times, something Martinovic has done 10 times as of Wednesday.

Puzzles have helped push the NY Times’ total digital subscriber numbers over the 10m mark, but they aren’t just a useful driver of subscriptions, they also boost engagement metrics.

The Official Agatha Christie Puzzle Book Agatha Christie Ltd Do you have the flair, order and method of Hercule Poirot, or the unassuming shrewd intelligence of Miss Marple?