When video gaming first started, almost all of the games created were playable by children. Not to say that early games weren't enjoyable by many adults (they were), they just lacked the mature themes that would be unsuitable for younger audiences. Some of this was due to the Censorship Bureau imposed by Nintendo in the early 1990s; when Nintendo dropped this and backed an industry-supported ratings system, developers became free to develop whatever they desired, and thus began making games that were more realistic in their depiction of violence, and along the way, containing Darker and Edgier themes than previous titles.