backrooms-1.1.1-[1.21-1.21.1].jar is a release file of the Minecraft mod Backrooms! for Fabric, Forge, NeoForge, Quilt, made for Minecraft 1.21, 1.21.1. It was published on July 6, 2026 and is 1 MB in size. For the full description, screenshots and every other version, visit the Backrooms! mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
