Changyou.com Limited is an online game developer and operator in China. The Company engaged in the development, operation and licensing of online games, including multiplayer online games (MMOGs), which are interactive online games that may be played simultaneously by hundreds of thousands of game players, and Web games, which are played over the Internet using a Web browser. The Company also own and operate the 17173.com Website, one of the information portals for gamers in China. The Company directly operates several Web games on the Company�s own Websites and also jointly operates DDTank and Wartune, developed by 7Road, with third-party joint operators in China and overseas. DDTank is a two dimensional (2D) multi-player, combat and role-playing Web game in China. Game players control avatars to compete with other game players. Wartune is a popular 2.5 dimensional (D) role-playing and quasi real-time strategy Web game.