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Resources / Mods / Underground Worlds

Underground Worlds

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

ModsFree1.19 – 26.x
by HexagonNico · listed from Modrinth
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Direct download from Modrinth · 3,086,188 downloads

Underground Worlds screenshot 1Underground Worlds screenshot 2Underground Worlds screenshot 3

What it does

Underground Worlds is a mod made by HexagonNico. Adds underground biomes and underground dungeons, as well as some above ground structures, in a modular and configurable way.

It supports Minecraft 1.19 – 26.x. It has been downloaded 3,086,188 times on Modrinth. The last update came out on Sep 2, 2026.

Supported versions

26.x1.211.201.19

Release history

Underground Worlds has had 157 releases on Modrinth since Oct 1, 2023. 88 of them came out in the past year. The newest is 3.2.1-26.1, released on Sep 2, 2026. It is made for Minecraft 26.2. It runs on NeoForge. The download is 3.9 MB.

VersionReleasedMinecraftType
3.2.1-26.1Sep 2, 202626.2Release
3.2.1-26.2Sep 2, 202626.2Release
3.2.1-26.2Sep 2, 202626.2Release
3.2.1-26.1Sep 2, 202626.1, 26.1.1, 26.1.2Release
3.2.1-26.1Sep 2, 202626.1, 26.1.1, 26.1.2Release
Description from the author on Modrinth

Underground Worlds is a Minecraft mod that adds underground biomes and underground dungeons, as well as some above ground structures, in a modular and configurable way.

About

Underground Worlds was born as Underground Jungle, a mod that added an underground jungle biome and a jungle temple somewhat inspired by the one in Terraria.

When the development continued and more biomes were added, I decided it would have been better to put all biomes in the same mod and allow users to enable and disable features through config files instead of making a separate mod for each biome.

All biomes added by Underground Worlds can be enabled or disabled in the config.
The config can also disable certain features for each biome.

Features

Underground Worlds adds new underground biomes and structures, each with their own set of features.
Biomes and structures can have their exclusive mobs, set of tools, and other special items.

A full list of features can be found in the Wiki.

Additional information

When using Underground Worlds alongside other world generation mods, it may be necessary to use TerraBlender or Lithostitched for the biomes to generate in the world.

Main mod page

Modrinth: modrinth.com/mod/underground-worlds

Curseforge: curseforge.com/minecraft/mc-mods/underground-wo…

If you find this mod on other distribution platforms, these are NOT managed by me.

Credits

Mod Author: HexagonNico

Chiseled Temple Bricks texture by Matriax (CC-0)

Jungle bee model by FrostYieBoiy (CC-BY 4.0)

Wrapped model by Nightfoxy3D (CC-BY 4.0)

"Abbeyence" music by Spring (CC-BY 3.0)

Questions and answers

Q: Can I use this in my modpack?

A: Yes. You don't need to ask for permission. See [License](#license) for details.

Q: Can you port this mod to 1.\d\d.\d?

A: I can, but remember that I'm a human being and porting the mod to another version requires additional effort to maintain each version. Please refrain from opening issues like "Port to 1.3.2 when".

Q: Can you translate this mod to ww_ww?

A: You can submit a pull request if you want to contribute!

License

This mod is licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International.

You are free to share, copy and redistribute this mod in any medium or format, including modpacks, adventure maps, and
other creations made within Minecraft, as long as you respect the following conditions.

  • You must give appropriate credit.
  • You may not use the mod for commercial purposes.
  • If you create a modified version of this mod, you may not redistribute the modified version.

You are free to use this mod in any modpack, as long as you do not sell it via any means.
You cannot re-upload this mod on other mod distribution platforms.

Written by HexagonNico. Read it with pictures on Modrinth.

How to install Underground Worlds

  1. This mod is needed on both the server and every player who joins.

  2. Install Fabric, Forge and NeoForge for Minecraft 1.19 – 26.x.

  3. Download the .jar file from Modrinth and put it in the mods folder of your .minecraft directory.

  4. Start Minecraft with the Fabric profile.

  5. Easier: in Prism Launcher or the Modrinth App, search for Underground Worlds in your instance's mods and click Install. It adds the loader and the mods it needs for you.

Full guide: How to install Minecraft mods

Compatibility

Minecraft versions
26.x, 1.21, 1.20, 1.19
Runs on
Fabric, Forge, NeoForge
Where it runs
Client and server
Edition
Java
Needs
TerraBlender, Variants&Ventures, Lithostitched, Biolith, Friends&Foes (Forge/NeoForge), Curios API
License
CC BY
Price
Free
Upkeep
Actively updated (Nov 11, 2026)

Underground Worlds compared with similar ones Compare all alternatives

ResourceDownloadsVersionsLast updatePrice
Underground Worldsthe one you looked at3.1M1.19 – 26.xSep 2, 2026Free
YUNG's Cave BiomesYUNGNICKYOUNG4.6M1.18 – 26.xAug 19, 2026Free
Mischief Illagerstamir73.5M1.20May 8, 2025Free
Nether Depths UpgradeScouter5673.4M1.16 – 1.21Sep 21, 2026Free

Questions

Does Underground Worlds work on Minecraft 26.x?

Yes. Underground Worlds supports Minecraft 26.x. All supported versions: 26.x, 1.21, 1.20, 1.19.

Is Underground Worlds free?

Yes. Underground Worlds is free to download from Modrinth.

Is Underground Worlds client-side or server-side?

Both. The server and every player need Underground Worlds installed.

Does Underground Worlds need anything else?

Yes: TerraBlender, Variants&Ventures, Lithostitched, Biolith, Friends&Foes (Forge/NeoForge). Install it before Underground Worlds.

Is Underground Worlds still updated?

Yes. The last update came out in the past day.

What are the best alternatives to Underground Worlds?

The closest ones are YUNG's Cave Biomes, Mischief Illagers and Nether Depths Upgrade. Compare all alternatives

Alternatives to Underground Worlds

Nether Depths UpgradeMods · 1.16 – 1.21

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Blue SkiesMods · 1.16 – 1.20

Blue Skies is survival mod that adds aspects like dimensions, dungeons and more in a light and dark scenario.

Free2,734,393 downloads
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