On-line games would be regulated under Chinese law which will protect children from unhealthy material and Internet addiction.
The regulation, issued by the Ministry of Culture on June 22, states that on-line games targeting minors must be free of content that lead to the imitation of behavior that violates social morals and the law, Xinhua reports.
It also requires gaming companies to develop techniques that limit the gaming time of minors in order to prevent addiction. But the regulation did not specify the techniques and the permissible gaming time.
The issue drew national attention last year following a series of deaths at boot camps for Internet addicted youth.
Further, web players will now have to register using their real names before playing games online, according to the regulation.
China's on-line population reached 420 million by June 2010, according to data from the China Internet Network Information Center.
Several separate sets of regulations will also come into force on Sunday, including one that governs army service, and another that stipulates health care institutions would face punishment for withholding certain information to patients and the public.