When your parents are not sure, it is best if you ask a Catholic priest.
“Other Catholics” tend to have many different opinions about a particular RPG, videogame, movie, book etc.
One reason for this is that people are different in what creates an occasion of sin for them personally. I might be able to play a videogame and not think twice about it, someone else might be inspired to have sinful thoughts. It also varies a bit based on people’s age and why they are playing the particular game (for example, if you are an adult who designs games or reviews them for a publication, it’s different from being a young teen who just plays an occasional game). And finally it also varies on personal taste. Some people think all games are bad, or all RPGs are bad, etc.
Priests, especially those who work a lot with teenagers, provide the best guidance on these things. If you can’t find such a priest, then you might want to ask the leader of a Lifeteen group or a deacon who works with youth ministry, etc.