ModsJava
Inside the backrooms blocks
Java mod listed for Minecraft 1.20. File opened and checked on 1 Oct 2026; downloads from the MC Java Mods app on Android.
This mod adds blocks for backroom style buildings.No new dimensions, just your creativity. Free Minecraft Java mod for 1.20.1.
⬇ Download on CurseForgeThe author built this one for Minecraft 1.20.1 on Forge. On other versions it may install and then do nothing.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.20.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
File checked by MCModsHub
- Ships as inside_the_backrooms-1.2.9-forge-1.20.1.jar — drop this file into the mods folder
- Download size: 28.6 MB
- Download link checked 3 Oct 2026 — working
These come from our own check of the pack file, not from the source page.