@matt These are the ratings used after 2006
CERO A
CERO B
CERO C
CERO D
CERO Z
They also have a list of ratings used before 2006, which are:
Previous ratings
The ratings for video games in Japan prior to March 2006 are:
All ages replaced by A
12 and older replaced by B
15 and older replaced by C
18 and older replaced by D and Z
The primary difference between the two rating systems was the inclusion of the "17 and older" rating, due to the large gap between the "15 and up" and "18 and up" ratings.
I believe we should list them as:
CERO All ages
CERO 12+
CERO 15+
CERO 18+
Also, I didn't see the link above, but I'll post this anyway, ha. :|