Interactive ChatGPT Chat Room from long prompt

About a year ago I remember seeing prompts that were very long and also had the effect of making the Chat interface appear differently. The prompts also had layered questions and felt more like a software app embedded within the prompt by how it behaved. I don’t remember if it had anything to do with, or was just around the same time as LangChain.

Does anybody else remember these type of prompts that nobody seems to use anymore? Any help would be much appreciated.

Thanks,
Matt