Riddle, also known as なぞなぞ, is a captivating web novel in Japanese that presents readers with a collection of intriguing riddles designed to challenge and stimulate the mind. The novel spans across genres such as drama, historical, and romance, offering a diverse reading experience. With themes like age progression, death of loved ones, and a European ambience, Riddle follows a hard-working male protagonist through a series of oneshot stories that promise to engage and entertain readers while exercising their mental faculties.