Guess The Book is an online daily puzzle game that challenges players to identify a book from excerpts drawn from its text. Each puzzle presents several passages as clues, along with the book’s Goodreads rating count, and gives players a limited number of guesses to submit an answer. A new game becomes available on a recurring schedule, making the site suitable for a quick daily challenge as well as casual browsing.

Players can also explore related puzzle experiences through a network of sister sites focused on identifying games, audio, movies, logos, houses, angles, phrases, grids, secret words, and golf challenges. For users seeking additional features, the site advertises a membership option that includes an ad-free experience, statistics export and import, exclusive content and requests, cross-device syncing, and direct messages. Guess The Book notes that it is not affiliated with the publishers or rights holders of the works featured, and that excerpts or other puzzle materials may change or be removed