Quote Originally Posted by Vyk
I can't tell if you're being sarcastic or speaking strictly from the ESRB rating system. But before the ESRB formed a system, Sega had long since been rating their own games for content. The ESRB just took that over
I'm actually being serious. In the United States, before the release of Mortal Kombat II, there were no ratings on games. Furthermore, when they did establish the rating system, it wasn't until Grand Theft Auto: San Andreas that anyone would release a game needing of an AO rating (there were games that people attempted to release before with the AO rating, but no one would sell them).

So yeah, there weren't any, here in the US anyway. Even Night Trap had only an "M" rating, and it was pulled from the shelves for awhile.