SHANGHAI (NYTimes) - In China, teenagers can purchase a fake ID online for as little as US$2 (S$2.70). Is it for buying booze? Subverting the state? Many simply want to play a game on their phones.

More than 200 million people in China play Honour Of Kings, the social media-focused app that has become the biggest moneymaking smartphone game in the world. On Wednesday, its creator, the Chinese Internet conglomerate Tencent Holdings, said that Honour Of Kings helped power a nearly 40 per cent rise in its game revenue in the three months ended June.

But the game's popularity among the young has alarmed Chinese officials. In response, Tencent has added restrictions that limit those under age 12 to an hour of play a day, and those between 12 and 18 to two hours a day.

Like savvy Chinese Internet users have done for years, many players have found workarounds.

One is Min Jingxi, a 17-year-old student. She plays the game up to five or six hours a day during her summer vacation - often as a character named Wang Zhaojun, a famous beauty from Chinese history - thanks to a fake identity she has established online.

"If you don't do real-name verification for your new accounts, the system has no way to know how old you are, so there won't be any limits," she said. "I have two accounts and most of my friends also do this to bypass the restrictions."

Honour Of Kings offers swashbuckling sword-and-sorcery action through characters familiar to Chinese players. The game pits one team of up to five players against another in a magical land. Adding to its addictive gameplay, friends can fight with or against one another in private rooms and see one another's scores on social media.

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 Honour 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 before an important Communist Party meeting this autumn. 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 such as pornography and violence, as well as smaller targets like on-screen smoking and 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 Honour 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 Honour Of Kings. Xianyu, an online second-hand trading platform, carries listings that offer to sell adult IDs for as little as US$2 and tutorials on more ways to circumvent the restrictions. Game accounts started by others can sell for US$30 to US$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, deputy director of the Juvenile and Social Problems Department at the Chinese Academy of Social Sciences.

Honour 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, Honour Of Kings generated about US$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 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," he said, "but I hope China will have more games like Honour Of Kings in the future."