Wrong Yellow — Vanilla Backrooms Datapack

Minecraft has places it forgot to generate correctly.

.1

.2

CURRENT BUILD
Wrong Yellow v1.0.0-rc3 — The Missing Walls Update

RC3 adds giant splits, massive runtime-generated structures, the C-wall, player imitation, new survival systems, and a major performance-focused rebuild.

No mods.
No resource pack.
Minecraft Java 1.21.11.

Wrong Yellow is a vanilla Minecraft Java datapack that adds a hidden liminal dimension inspired by the Backrooms — not as a copy, but as something Minecraft 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.

This page exists for people who want to support the project. The datapack is meant to be playable by everyone, and public releases will also be available on Modrinth.

If Wrong Yellow gives you that strange little liminal feeling, buying it here helps me keep developing future layers, performance improvements, experimental mechanics and devlogs.

Current status

This is the 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.

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

Recommended test settings

• Minecraft Java 1.21.11
• Server RAM: 6–8 GB recommended
• view-distance: 12 recommended
• simulation-distance: 4–6 recommended

For stronger machines or recording, you can try:

• view-distance: 12
• simulation-distance: 6

Installation

Singleplayer

1. Download the .zip.
2. Create or select a Minecraft Java world.
3. Click Edit.
4. Click Open World Folder.
5. Put the .zip into the datapacks folder.
6. Start the world.
7. Run /reload if needed.

Server

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

world/datapacks/

1. Start the server.
2. 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.

AI assistance disclosure

Some datapack code and documentation were developed with AI assistance, then manually tested, edited and integrated.

Thank you

I spent the last weeks building this almost obsessively: procedural rooms, wells, roof escapes, wall anomalies, dizzying transitions, and a first yellow layer designed to feel native to Minecraft rather than imported from somewhere else.

The datapack is meant to be playable by everyone. Supporters help me keep developing it: future layers, better performance, experimental mechanics, devlogs, early builds, and all the strange things that may come after the Yellow layer.

I’m an independent dad and creator going through a difficult financial period, so this support has a very concrete impact. It helps me buy time to keep making weird, generous things like this.

Download free:
Modrinth: https://modrinth.com/datapack/wrongyellow
CurseForge: https://www.curseforge.com/minecraft/data-packs/wrong-yellow
itch.io: https://wrongyellow.itch.io/wrongyellow

Support future layers:
Patreon: https://www.patreon.com/cw/WrongYellow
Ko-fi: https://ko-fi.com/wrongyellow

Follow the project:
YouTube: @WrongYellow
X: https://x.com/wrongyellowx