IllegalBuilding-1.21.8-9.0.0.jar is a beta file of the Minecraft mod Illegal Building for NeoForge, made for Minecraft 1.21.8. It was published on September 17, 2025 and is 0.1 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the Illegal Building mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
