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Modrinth Modrinth · Mod

How to install "Underground Worlds"

Adds underground biomes and underground dungeons, as well as some above ground structures, in a modular and configurable way.

Author

HexagonNico

Downloads

2.5M

Last Updated

May 15, 2026

License

CC-BY-NC-ND-4.0

Mod Loaders

Fabric Forge NeoForge

Minecraft Versions

26.1.2 1.21.10 1.20.4 1.19.4
adventure decoration equipment mobs storage worldgen

Quick Install ID

#underground-worlds

Install Underground Worlds in GDLauncher

Underground Worlds runs on Fabric, Forge, NeoForge. Pick whichever your existing instance uses, or create a new one. GDLauncher installs the correct loader automatically.

Install on Fabric

  1. Open GDLauncher and create a new instance (the + button on the Library page).
  2. Pick the Fabric loader and a Minecraft version that Underground Worlds supports (26.1.2, 1.21.10, 1.20.4 are common choices).
  3. Open the new instance, go to the Addons tab, and click Add Addons.
  4. Paste the Quick Install ID #underground-worlds, find Underground Worlds in the results, and hit Download. GDLauncher pulls dependencies automatically.
  5. Hit Play. That's it.

Install on Forge

  1. Open GDLauncher and create a new instance (the + button on the Library page).
  2. Pick the Forge loader and a Minecraft version that Underground Worlds supports (26.1.2, 1.21.10, 1.20.4 are common choices).
  3. Open the new instance, go to the Addons tab, and click Add Addons.
  4. Paste the Quick Install ID #underground-worlds, find Underground Worlds in the results, and hit Download. GDLauncher pulls dependencies automatically.
  5. Hit Play. That's it.

Install on NeoForge

  1. Open GDLauncher and create a new instance (the + button on the Library page).
  2. Pick the NeoForge loader and a Minecraft version that Underground Worlds supports (26.1.2, 1.21.10, 1.20.4 are common choices).
  3. Open the new instance, go to the Addons tab, and click Add Addons.
  4. Paste the Quick Install ID #underground-worlds, find Underground Worlds in the results, and hit Download. GDLauncher pulls dependencies automatically.
  5. Hit Play. That's it.

Before you install

Make sure your Minecraft version matches what Underground Worlds supports. As of the latest release, 26.1.2, 1.21.10, 1.20.4 are supported. Underground Worlds supports multiple loaders (Fabric, Forge, NeoForge); pick whichever matches your other mods. GDLauncher checks compatibility for you and won't install something incompatible with the instance you've chosen.

Frequently Asked Questions

Is Underground Worlds free?

Yes. Underground Worlds is free to download and install through GDLauncher. GDLauncher itself is also free and ad-free.

What Minecraft versions does Underground Worlds support?

Underground Worlds supports Minecraft 26.1.2, 1.21.10, 1.20.4, 1.19.4. GDLauncher will automatically pick a compatible version when you install it.

Does Underground Worlds require Forge or Fabric?

Underground Worlds supports Fabric, Forge, NeoForge. Pick the loader that matches your other mods, or let GDLauncher set up a fresh instance for you.

How do I install Underground Worlds?

Open GDLauncher, go to your instance's Addons tab, click Add Addons, and paste the Quick Install ID #underground-worlds. GDLauncher handles dependencies and the right Minecraft version automatically.

Who made Underground Worlds?

Underground Worlds is made by HexagonNico. The full project lives on Modrinth (https://modrinth.com/mod/underground-worlds).

Need help?

Read our troubleshooting guide, check the guides section, or join the GDLauncher Discord community.

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