Backrooms Through The Walls
Backrooms Through The Walls adds level 0 and level 1 bacteria entities to Minecraft, with an inventory and build rules that differ between the two levels.
What it does
Players who enter the backrooms levels meet bacteria entities on level 0 and level 1, and the entities can clip through walls. Level 0 keeps its own separate inventory, and items placed there cannot be used to place blocks. Level 1 lets players build with whatever they carry. The mod is published for Fabric only, and it runs on the client and the server, so both sides need it. The current build is 1.7.1 for 1.21.1, released on 2025-12-05.
The mod needs a shader stack to run, and the required shader support is listed as a requirement on the mod's page. A custom shader installs automatically, and it must be applied to a dimension. Its base is Spooklementary, and the author has posted images of testing with other shaders, with more planned for future levels. The author describes the beta as heavily buggy, and the dimension shader can leave the game in a broken state that still works.
Key features
Bacteria entities
Bacteria mobs appear on level 0 and level 1, and they can clip into walls as they move.
Separate level 0 inventory
Level 0 has its own inventory, and items carried there cannot place blocks.
Free building on level 1
On level 1, players can build with any items they hold.
Custom dimension shader
A shader installs with the mod and must be applied to the dimension to take effect.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Backrooms Bounded is open source under the MIT License and is built for 1.21.1 on Fabric, with both sides running it. The Backrooms: Beta Release is also Fabric and client and server, under the MIT License, but its files target 1.21.11. Escape the Backrooms covers 1.21.1 – 1.21.11 on Fabric with All rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Backrooms Through The Walls | Fabric | 1.21.1 | Client and server | 2025-12-05 |
| Backrooms Bounded | Fabric | 1.21.1 | Client and server | 2026-08-16 |
| The Backrooms: Beta Release | Fabric | 1.21.11 | Client and server | 2026-08-21 |
| Escape the Backrooms | Fabric | 1.21.1 – 1.21.11 | Client and server | 2026-06-05 |
Questions
Does Backrooms Through The Walls need a shader stack?
Does the server need Backrooms Through The Walls?
Is the mod stable?
In the catalog
Backrooms Through The Walls is one of 7,555 Cursed mods on ModsFinder, and one of 4,235 Cursed mods for Fabric. 32,366 mods support Minecraft 1.21.1.
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What the author says
Adds backrooms level 0 and 1, and the bacteria entity can be entered by no clipping. Level 0 has its own separate inventory, so you won't have any items and can't place any blocks. In level 1, you will have your items and be able to build and do whatever. Has a custom shader that auto-installs; you must apply it when…
Official listing
- Modrinth page
- modrinth.com/mod/backrooms-through-the-walls
- Owner
- Synth_Cat_Studios
- Published
- 2025-11-22
- Updated on Modrinth
- 2025-12-05
- Facts verified
- 2026-10-15