How do I install Behind the Cubes [Backrooms]?

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. Opens on CurseForge — not every file is mirrored on our own servers.

What Minecraft version does Behind the Cubes [Backrooms] work with?

The listing gives Minecraft 1.21.1, 1.20.1. This is the version stated by the author or source site, not something we verified ourselves.

Home›Java›Mods›Behind the Cubes [Backrooms]

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Behind the Cubes [Backrooms]

Java mod listed for Minecraft 1.20–1.21. File opened and checked on 9 Oct 2026; downloads from the MC Java Mods app on Android.

by diamond_ilya · on CurseForge

Which build do you need?

This mod ships a separate file for every mod loader and every version of the game. Pick both, then download — the wrong build installs fine and then does nothing in the game.

Mod loader

Mod loader NeoForge1 build
Mod loader Forge1 build

Minecraft version

Minecraft 1.21.1Newest

Minecraft 1.20.1Newest

⬇ Download for 1.21.1 · NeoForge ⬇ Download for 1.20.1 · Forge

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.

Open in MC Java Mods Get it on Google Play →

Behind the Cubes [Backrooms] — screenshot 1

Behind the Cubes [Backrooms] — screenshot 2

Behind the Cubes [Backrooms] — screenshot 3

Behind the Cubes [Backrooms] — screenshot 4

Behind the Cubes [Backrooms] — screenshot 5

Behind the Cubes [Backrooms] — screenshot 6

Behind the Cubes [Backrooms] — screenshot 7

Behind the Cubes [Backrooms] — screenshot 8

📄Description:

This mod adds the Backrooms, where players can start their survival when creating a new world.

🧭Levels:

Level 0 - "Tutorial Level"
Level 0.2 - "Remodeled Mess"
Level 0.3 - "The Icy Rooms"
Level 1 - "Habitable Zone"
Level 2 - "Abandoned Utility Halls"
Level 3 - "Electrical Station"
Level 4 - "Abandoned Office"
Level 4.4 - "Crazed State"
Level 6 - "Lights Out"
Level 13 - "The Infinite Apartments"
Level 287 - "Glitched Halls"
Level 444 - "The Level Without Form"
Unnumbered Level - "The Hub"

🌐Discord Server:

https://discord.com/invite/C7PdkffkFW

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft versions listed: 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.

File checked by MCModsHub

Ships as backrooms_a23sd42324b-1.6.1-forge-1.20.1.jar — drop this file into the mods folder
Download size: 2.0 MB
Download link checked 17 Oct 2026 — working

These come from our own check of the pack file, not from the source page.

Explore more

All Mods for Java All Minecraft Java mods Java mods for 1.21 Java mods for 1.20