The Complex
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
⬇ Download on Modrinth
Do you want to prank your friends by putting them into liminal purgatory? This is the mod for you!
This mod adds various Backrooms-themed blocks for you to build your own winding disconjoined maze of fluorescent lights and ugly carpet. Or... you could use them for your house. We don't judge here.
I found something.
Okay. What did you find?
Found a place.
It's massive in there.
And it just goes on and on and on.
All these rooms.
This place builds them.
Actually, more like it... remembers them.
And the more times it remembers something, the less it does.
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.8
- 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 Modrinth — 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.
- Ships as complex-1.2.0-neoforge-1.21.8.jar — drop this file into the mods folder
- Download size: 16.6 MB
- Download link checked 10 Nov 2026 — working
These come from our own check of the pack file, not from the source page.