Hexagon is an ongoing private/replacement server project for the now-defunct game Hexis. Hexis was a free-to-play rhythm game developed by Daniel (Dienay), drawing inspiration from both osu! and the Nintendo DS game Elite Beat Agents. The project was discontinued indefinitely in 2017, and very little information about it remains today.
It is recommended to set up this project using the hexagon-deploy repository, and use the env_run.sh command for development purposes afterwards. Please note that this project is still in early development and far from complete, as reverse engineering is a very time-consuming process.