New Zealand uses a variety of complicated ratings.
G-Suitable for all ages.
PG-Parental guidance suggested.
M-Recommended for ages 16 and over.
R13-Restricted to 13 and over.
RP13-Restricted to 13 and over unless accompanied by an adult.
R15-Restricted to 15 and over.
R16-Restricted to 16 and over.
RP16-Restricted to 16 and over unless accompanied by an adult.
R18-Restricted to 18 and over. wikipedia:While You Were Sleeping (film) (1995) was first rated, in New Zealand, R18, due to bad language. A PG-rated copy was also released, but lacks the bad language.
R-Restricted to a certain purpose (doctors).