OSU Touch Grass

Players run osu lazer inside Minecraft through a CoreCLR runtime embedded in the Minecraft JVM, with both sharing one OpenGL texture. The build tracks osu 2026.505.0 on osu-framework 2026.428.0, and the source is bundled with the mod. Input comes from a pen, mouse or keyboard combined into crafted items that a player holds in hand, and holding Shift lets the player interact with Minecraft while playing.

A monitor block of arbitrary size is placed in the world and launched with a redstone signal, and several independent screens can run at the same time. Score submission, per-world leaderboards with weighted pp rankings, friends, profile pages and presence chat travel over a network transport layer re-implemented on top of Minecraft packets. Beatmaps are imported by dropping .osz files into the osutouchgrass-maps folder.

On first boot the mod extracts about 370 MB of bundled CoreCLR and osu binaries into osutouchgrass-cache. Game data such as beatmaps, scores and settings is stored in an osutouchgrass folder that is isolated per Minecraft instance. The mod is for NeoForge 1.21.1 only and requires Architectury API. It runs on client and server, and the code is under a custom license that is not open source.