Visitors participate in Gamescom 2019 in Cologne, Germany

A visitor tries a VR game at the Gamescom 2019 in Cologne, Germany, on Aug. 20, 2019. This year's gamescom, one of the world's largest trade fairs for video games, opened to the public in the German city of Cologne on Tuesday with a focus on cloud gaming. (Xinhua/Lu Yang)