USK 18 is a classification rating used in Germany to indicate that a video game is suitable only for adults aged 18 and older. This rating is assigned by the Unterhaltungssoftware Selbstkontrolle (USK), which is responsible for the age rating of video games in Germany. Games rated USK 18 may contain explicit content, including violence, strong language, or sexual themes. The USK 18 rating is part of a broader system that includes other age classifications, such as USK 6, USK 12, and USK 16. These ratings help consumers make informed choices about the content of video games. Retailers are required to enforce age restrictions for USK 18 games, ensuring that only adults can purchase them.