Wrong Yellow

Minecraft has places it forgot to generate correctly.

Wrong Yellow is a vanilla Java datapack that adds a hidden liminal dimension inspired by the Backrooms — not as a direct copy, but as something the game itself could have generated by mistake.

No mods. No resource pack. Just vanilla Minecraft, bent into a strange yellow place behind the walls of the world.

Features

A hidden vanilla Backrooms-inspired dimension
Procedural jigsaw-based generation
Survival-compatible exploration
Overworld wall anomalies
Dizzying transitions between worlds
Roof escape system
Dense yellow rooms, wells and impossible architecture
No mods required
No resource pack required

Current status

This is the first release candidate of Wrong Yellow.

It is playable, but still needs public testing. Please consider it a near-v1.0 build: the core experience is here, but small fixes and performance adjustments may follow quickly.

Recommended settings

Minecraft Java 1.21.11
Server RAM: 6–8 GB recommended
view-distance: 8–10 recommended
simulation-distance: 4–6 recommended

For stronger machines or recording, you can try:

view-distance: 12
simulation-distance: 6

This place shouldn't remind you of anything.

Installation

Singleplayer

Download the .zip.
Create or select a Minecraft Java world.
Click Edit.
Click Open World Folder.
Put the .zip into the datapacks folder.
Start the world.
Run /reload if needed.

Server

Stop the server.
Open your world folder.
Put the .zip into:

world/datapacks/

Start the server.
Run /datapack list to check that Wrong Yellow is enabled.

Known limitations

This is still a release candidate, not a fully tested stable release.
World generation can still be heavy on modest machines.
Feedback is very welcome before the stable v1.0.0 release.

In case of emergency, use stairs.

Support

Wrong Yellow is meant to be playable by everyone.

If you enjoy it and want to support development — future layers, performance improvements, experimental mechanics and devlogs — you can support the project here:

Modrinth: https://modrinth.com/datapack/wrongyellow
Patreon: https://www.patreon.com/c/WrongYellow
Ko-fi: https://ko-fi.com/wrongyellow
itch.io: https://wrongyellow.itch.io/wrongyellow