Discover the best video game subscription services, ranked by library size, variety, value, and overall appeal for different ...

Summer in Ann Arbor, Mich., means thousands of people hunting for hidden codes around the city and reading books to earn points. It's part of a popular game organized by the public library.

Summer for thousands of people in Ann Arbor means scavenging for hidden codes around the city and reading books to collect points. It's been a triumph for the public library that runs it.