ModsJava
BBL Rooms
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
BBL Rooms
Overview
BBL Rooms adds a single item The Placer. The Placer can be used to place certain structures in world. Template use normal vanilla structure files. You can customize a lot of the placing setting like clicking on a certain block, certain height level, requiring blocks or not see the wiki for more information
Support
Join the BBL Discord for support, report bugs and suggest features or additions. You can also support me on Patreon to gain Alpha access to Modpacks and Mods in dev

Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21, 1.21.1, 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.
Verified by MCModsHub
- Ships as roomopolis-1.20.1-1.0.4.jar — drop this file into the mods folder
- Download size: 120 KB
- Download link checked 27 Aug 2026 — working
These come from our own check of the pack file, not from the source page.