Mobile games particularly have enjoyed a boom, and among them, games from Chinese studios are gaining popularity. Chinese publishers claimed 21 spots among the 100 top-grossing games in the period and collectively generated $780 million in revenues in the U.S., the world's largest mobile gaming market, more than triple the amount from two years before. Occupying the top rank are familiar Chinese titles such as the first-person shooter game Call of Duty, a collaboration between Tencent and Activision, as well as Tencent's PlayerUnknown's Battlegrounds.