These new rules serve to tighten earlier limits set in place by the Chinese government, which had restricted online playtime to 90 minutes during the weekdays and three hours on weekends for those under 18. Gaming consoles like the Sony PlayStation or Microsoft Xbox have been banned in China since 2000. Children and teenagers may game only on Fridays, Saturdays, Sundays, and national holidays — and only between 8 p.m. and 9 p.m. Online game vendors have already complied with the new rules and are now requiring logins that are real-name verified. Tencent, the country’s leading gaming developer, has even...