Backrooms: Kepler
by Julian_x_why
Backrooms: Kepler adds backrooms-style areas to a Minecraft world, reached through a chance-based entry that players can trigger by surfacing themselves.
What it does
Backrooms: Kepler adds backrooms content to vanilla Minecraft through a datapack. After installing it, a player must rejoin the world with the datapack enabled through the datapack command, and entry into the backrooms has a one in three chance once the player surfaces. The mod's own notes recommend version 0.3.1 over the current 0.3.2 test build, and a resource pack is suggested for a closer look. Only the server needs the mod, since players join without installing it. Simple Datapacks is an optional dependency, and the code is under the MIT License, though the project is not open source. Files exist for 1.21.5 only, for Fabric, Forge and NeoForge.
Key features
Backrooms areas
The datapack adds backrooms-style areas that a world can reach through a surfacing check.
Entry chance
Getting into the backrooms has a one in three chance once the player surfaces, so entry is a matter of chance.
Planned entity
The author plans to add a simple entity in a future update, which is not part of the current build.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Optional 1
How it compares
The Backrooms(legacy) is server-side, released under the MIT License, with files for 1.21.4 – 26.2 on Fabric, Forge, NeoForge and Quilt. Blackrooms Horror is also server-side and covers 1.21.8 – 26.2, but it is released under All rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Backrooms: Kepler | Fabric, Forge and NeoForge | 1.21.5 | Server required, client optional | 2026-09-08 |
| The Backrooms(legacy) | Fabric, Forge, NeoForge and Quilt | 1.21.4 – 26.2 | Server required, client optional | 2026-06-18 |
| Blackrooms Horror | Fabric, Forge, NeoForge and Quilt | 1.21.8 – 26.2 | Server required, client optional | 2026-09-28 |
Questions
Does Backrooms: Kepler need to be installed on the client?
In the catalog
Backrooms: Kepler is one of 7,555 Cursed mods on ModsFinder, and one of 4,235 Cursed mods for Fabric. 15,307 mods support Minecraft 1.21.5.
Similar mods
What the author says
Make sure to rejoin the world if you enable the datapack with the datapack command. To Get in the backrooms you must sufface yourself, 1 in 3 chance in get in.
Official listing
- Modrinth page
- modrinth.com/mod/backrooms-kelp
- Owner
- Julian_x_why
- Published
- 2026-07-11
- Updated on Modrinth
- 2026-09-08
- Facts verified
- 2026-10-15