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Puzzle solving (and posing) as a recreational pastime has a very long history. Mathematical Explorer can help in both posing and solving puzzles. Explore several examples that show how Mathematical Explorer can be used on many sorts of recreational problems. You will begin with a very interesting mathematical error by Sir Arthur Conan Doyle's Sherlock Holmes. For this problem, you are encouraged to compare your work to that of the great detective, so don't peek at the answers until you have pondered the question!