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Docs date

These docs were checked against commit f50e2fdf6 of 2026-11-10. They are updated in batches, so main can have changes that are not described here yet.

mcrs is Minecraft Java Edition written in Rust on Bevy ECS. It is a server, a client and the 122 crates they are built from.

Early WIP

The project is in active development and a lot is missing, including world saving, online mode and most of the gameplay. The world and the client already run.

Why mcrs

mcrs is not the Java server rewritten in Rust. It decides from scratch how the game should be built, and it starts with the engine. The page Why mcrs: a new design, not a rewrite explains each choice.

Pick where to start

I write plugins in Java or KotlinThere is no Bukkit-like API and no plugin loader. Read what you can do today.

I want to contributeBuild, test, clean-room rules and first tasks.

I want to take crates122 crates by layer. Nothing is on crates.io yet.

I play or run serversWhat mcrs is, what it is not, and who should look elsewhere.

Where the project stands

World generation matches the real game on reference dumps, and the client renders that world. Chunks are not saved and there is no online mode.¹² We checked this on 2026-11-10 at commit 3540f457b, against game snapshot 26.4-snapshot-7. The Status page has the full table.

You can ask questions and read progress reports on Discord.

Footnotes

1. WIP#78 Tracks saving changed chunks back to region files. ↩

2. WIP#82 Tracks online mode: encryption and session authentication. ↩