Show HN: Promptact – Learn system prompting by reverse-engineering conversations

Hey everyone, Built a simple game to help people understand and learn prompting through practice. It's like reverse engineering meets chatbot building - you observe a conversation and try to figure out what system prompt generated it. How it works: - You see a conversation between a user and an AI - Your goal is to write a system prompt that would generate similar AI responses - Get instant feedback through (embedding) similarity scoring - Progress through levels that teach different techniques - No sign-up is required - just visit and start playing The game is built with Next.js, TypeScript, and uses OpenAI for response generation and similarity scoring. You can try it right now at https://promptact.vercel.app/ https://promptact.vercel.app/ I'd love feedback from the community. This project was primarily developed for teaching about LLM to friends from non-AI fields -- Hence the limited number of levels for the time being. The source code is open and available on GitHub (https://github.com/detextit/promptact https://github.com/detextit/promptact). You'll need your own OpenAI API key to run it locally.