Changyou.com Limited is a developer and operator of online games in China. It engages in the development, operation, and licensing of massively multi-player online role-playing games, which are interactive online games that are played simultaneously by various game players. The company currently operates two multi-player online role-playing games (MMORPGs), including the in-house developed Tian Long Ba Bu and the licensed Blade Online. Changyou.com has three MMORPGs in the pipeline, which include the Duke of Mount Deer, Immortal Faith, and the Legend of the Ancient World. Based in Beijing, the People's Republic of China, Changyou.com Limited is a subsidiary of Sohu.com Inc.