The man from the southern boomtown of Guangzhou, aged about 30, died on Saturday after being rushed to the hospital from the Internet cafe, local authorities were quoted by the Beijing News as saying.
"Police have ruled out the possibility of suicide," the newspaper said, adding that exhaustion was the most likely cause of death. It did not say what game he was playing.
China, worried about the spread of pornography and, has banned the opening of new cybercafes this year and issued orders limiting the time Internet users can spend playing online.
In April, launched a campaign to rid the Internet of "unhealthy" content and make it a.