The 4 million represent ten percent of Chinese internet users under 18, according to the AFP. The term "unhealthy games" could refer to any number online games including Blizzard's World of Warcraft, which boasts millions of subscribers in China. The same games were called "spiritual opium" by another Chinese lawmaker earlier this year.
In the announcement, the Chinese government calls for hard-coded time limits in games and stricter content monitoring in games. Previously, the government has tried a number of methods to curb internet addiction, including cybercafe age and time limits.