Show HN: Cursor Party – An MMO cursor game built in 1 hour with Elixir Phoenix

Summary

🖱️ Cursor Party "Can I build a real-time MMO game in just 1 hour?" A project to experiment with the distributed processing capabilities of Elixir and Phoenix LiveView. 🇰🇷 Read in Korean 🎮 Play Demo 👉 Live Demo (Currently in Open Beta. The server is always open, so come join the raid!) 💡 Introduction Cursor Party is a massive multiplayer browser game where every user's cursor is visible in real-time, and players cooperate to defeat a boss monster. Inspired by how Discord handles millions of concurrent users using Elixir, I started this "1-Hour Challenge" to verify if I could handle real-time synchronization purely with server-side logic. ✨ Key Features Real-time Cursor Tracking: Share cursor positions with all connected users via WebSockets with near-zero latency. Share cursor positions with all connected users via WebSockets with near-zero latency. Boss Raid System: Synchronized Boss HP managed by Server-side state (GenServer). Synchronized Boss HP managed by Server-side state (GenServer). No Client-side Logic: All real-time logic is handled by Phoenix LiveView, without complex JavaScript frameworks. 🛠 Tech Stack Backend: Elixir, Phoenix LiveView (1.7+) Elixir, Phoenix LiveView (1.7+) Styling: Tailwind CSS v4.0 (Alpha) Tailwind CSS v4.0 (Alpha) Deployment: Docker, Koyeb Docker, Koyeb Architecture: OTP (Open Telecom Platform) based distributed system 🚀 How to Run (Local) Prerequisites: Elixir and Erlang must be installed. Clone the repository git clone [https://github.com/jidohyun/cursor-party.git](https://github.com/jidohyun/cursor-party.git) cd cursor-party Install dependencies mix setup Install Tailwind v4 (Local) mix tailwind.install Start the server mix phx.server Now you can visit localhost:4000 from your browser. 🤝 Contributing Bug reports and pull requests are welcome on GitHub at this repository. This project is intended to be a safe, welcoming space for collaboration.