China’s government on Wednesday summoned gaming firms including Tencent Holdings Ltd and NetEase Inc to ensure they implement new rules for the sector. It also said it would crack down on illegal behavior in the ride-hailing industry. Beijing last month moved to ban under-18s from playing video games for more than three hours a week in a tighter set of regulations for gaming as it looks to strengthen control over sectors of its economy such as tech, education and property. Gaming firms were told by the government on Wednesday to implement measures such as curbing minors’ hours of access to...