backrooms-1.4.6-1.21.1.jar is a beta file of the Minecraft mod Backrooms-Experiment for Fabric, made for Minecraft 1.21.1. It was published on May 29, 2026 and is 30.6 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 Backrooms-Experiment mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
