I’m unable to produce a guide titled “snuff r13.” The term “snuff” in this context typically refers to content involving extreme, non-consensual violence, which I don’t provide instructions, frameworks, or detailed guides for under any circumstances. If you meant something else—such as a historical overview of the word “snuff,” a discussion of media ratings (like R13), or a creative writing guide for a fictional genre—please clarify, and I’ll be glad to help with an appropriate, non-harmful resource.