The Chinese government has clamped down on the amount of time youngsters can spend playing online games, according to the official news agency Xinhua.
Under-18s who play for more than three consecutive hours a day will have limits imposed on the amount of points they can score, the agency reported.
Online game companies based in China have been given three months to install the so-called anti-addiction software.
It is part of an on-going attempt to limit how long people are online.
A recent report from the China National Children's Centre said that 13% of under-18s who used the web were addicted to online gaming.
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