GameIndustry.biz is reporting that Japan's Computer Entertainment Rating Organization (CERO), the Eastern equivalent to ESRB, has updated its ratings system to include a category similar to the Adults Only rating found in the US. The revised ratings system works as follows:

* A: all ages.
* B: ages 12 and older.
* C: ages 15 and older.
* D: ages 17 and older.
* Z: ages 18 and older, as regulated by the government.

With the exception of the Z rating, all other ratings are voluntarily followed. The new system will reportedly take effect on March 1st. It would make an interesting case study to see how a Z rating would affect a game, and how often it is used, compared to the Adults Only rating seen in the United States.