Age ratings in Australia are legally mandated, but the rating agency regularly refuses classification to video games. Until 2013, it was illegal to publish a video game unsuitable for 15-year-olds. The introduction of R18 for video games was a step forward, but it seems to be backsliding again. In 2019, Hotline Miami was prohibited from being re-released.

https://en.wikipedia.org/wiki/List_of_banned_video_games_in_...