grasscutters/grasscutter

Grasscutter is a private server reimplementation, meaning it recreates the server-side software for an anime game, allowing players to run their own local version of the game independently from the official servers. The description intentionally keeps the game name vague, referring to it as "a certain anime game." The way it works is that the game client (the game installed on your computer) can be redirected to connect to this custom server instead of the official one. Grasscutter handles logins, combat mechanics, the friends list, teleportation, the in-game gacha (loot box) system, inventory management, and partially co-op play. It also allows spawning enemies through a console command. An important caveat noted in the README: as of January 2025, the project is no longer actively maintained and only works with game version REL4.0.1. Users need to ensure their game client version matches the server version. Setup requires downloading Java 17 (a programming runtime), MongoDB (a database to store player data), and a specific old version of the game client. A companion tool called Cultivation helps automate the setup process on Windows. The server is built using Gradle, which is a standard Java build tool for compiling and managing code dependencies. Someone would use this if they want to play the game offline, experiment with server-side game mechanics, or explore the game without the constraints of official servers. The project is written in Java.