Tencent already allowed parents to monitor their children's use of the game, but it imposed the tougher restrictions last month, one day after People's Daily, the Communist Party's main newspaper, called Honor of Kings "poison to the teenager." This month, an official military newspaper warned that the game could distract soldiers from their duties.
China has tightened its grip on its domestic internet in recent months, in part because officials are seeking stability ahead of an important Communist Party meeting this fall. Last week, it ordered top online platforms to crack down on objectionable content.
The game reflects the paternalistic side of Chinese censorship, one that addresses the impact of modern media on society rather than on politics. Previous censorship drives included crackdowns on larger topics like pornography and violence, as well as smaller targets like onscreen smokingand displays of cleavage, as China's leaders sought to channel the country's culture in ways that it considered healthy and productive.
Those efforts are effective to an extent, but the various ways that young Chinese have found to play Honor of Kings show how difficult it can be to guide culture. In shadowy pockets of China's internet, users teach one another how to surmount a vast censorship apparatus. On video sites, uncensored versions of American television shows are available to download, often under different titles — "Scandal" becomes "The Bossy President in Love With Me," and "Breaking Bad" is renamed "Coke Daddy."
So it goes with Honor of Kings.
Xianyu, an online secondhand trading platform, carries listings that offer to sell adult IDs for as little as $2, and tutorials on more ways to circumvent the restrictions. Game accounts started by others can sell for $30 to $500, depending on how powerful and well-equipped the accounts are.
Tencent said in a statement that it was seeking to stop workarounds by younger players. "We are going to continue to cooperate with the government and make a joint effort to tackle this problem," the statement said.
Xianyu is owned by the Alibaba Group, China's e-commerce giant.
A representative for Alibaba did not respond to requests for comment.
Tencent so far has borne the brunt of official pressure, but experts say the Chinese government and the internet industry should work together to develop ratings systems and other methods to help govern how much time children spend playing the games.
"Mere restrictions through technical means aren't sufficient to prevent game addicts, but can actually be counterproductive and increase its social influence instead, bringing more publicity and interests to the game," said Tian Feng, the deputy director of the Juvenile and Social Problems Department at the Chinese Academy of Social Sciences.
Honor of Kings caters to Chinese sensibilities. Players can take the guise of figures from China's past or its legends. Like many games, players can use real-world money to make their characters more powerful. Players can connect through WeChat, Tencent's social-messaging and e-commerce app, which it says has nearly a billion users.
According to CNG, which runs a Chinese video game industry database, Honor of Kings generated about $828 million in revenue in the first three months of this year. That would make the game the biggest revenue generator among smartphone games globally, according to data from App Annie, a market research firm that tracks app performance.
The game is especially popular among the young. According to a report by Jiguang, a Chinese consulting firm, a little more than half of its players are less than 24 years old, while a quarter are under 18.
The game presents Chinese parents with a question well known in other countries: How much screen time should their children be allowed?
"Now it's summer vacation, so I think my son can play a bit more because almost all of his classmates are playing," said Ma Hong, mother of a third-grade student in Beijing. "You certainly don't want your son to be left out in his social life at school."
Jiang Hongtao said he began playing the game two years ago, when he was 17. Today Mr. Jiang, now 19, is one of the game's top players, meaning he can make a living from it. As many as one million people watch him play when he streams his games online, according to Huya, the Chinese video platform he uses. His mother acts as his agent.
"It used to be a Western-games dominated world," Mr. Jiang said, "but I hope China will have more games like the Honor of Kings in the future."