Alex's Caves (Unofficial Port)
by Raguto
Alex's Caves (Unofficial Port) brings five rare cave biomes hidden under the Overworld surface to NeoForge for Minecraft 1.21.1, ported by Raguto from the original mod by AlexModGuy.
What it does
The port adds five cave biomes that generate beneath the surface of the Overworld, each with its own terrain and creatures. Players reach them by digging or through natural openings, and the biomes are rare enough that most worlds contain only some of them. Raguto maintains the port independently, without any official link to the original developers.
Installation requires Citadel (Unofficial Port) to be present alongside the mod. Alex's Caves is released under the GNU Lesser General Public License v3.0 only, and its source code is public. Only NeoForge files exist, and the single game version covered is 1.21.1; the latest file, 2.0.10, was published on 2026-04-25.
Key features
Five underground biomes
Five rare cave biomes generate below the Overworld surface, each with a distinct layout and set of blocks.
Cave creatures
The biomes contain mobs that live in the caves and appear only in the areas where their biome generates.
World generation features
Cave structures and terrain features are placed during world generation, so new worlds show them without extra setup.
Citadel-based code
Shared behavior for the mod's mobs and effects runs through Citadel, which the port needs in order to start.
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.
Required 1
Required by 2 mods
How it compares
CavesChaos: More Caves & Biomes is a NeoForge-only mod for 1.21.1 under All rights reserved. Silent Caves covers Fabric and NeoForge for 1.21 – 1.21.1 under All rights reserved. Dynamic Trees - TFC Community Edition is open source under the MIT License for 1.21.1 and changes tree generation rather than caves.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Alex's Caves (Unofficial Port) | NeoForge | 1.21.1 | Client and server | 2026-04-25 |
| CavesChaos: More Caves & Biomes | NeoForge | 1.21.1 | Client and server | 2026-10-14 |
| Silent Caves | Fabric and NeoForge | 1.21 – 1.21.1 | Client and server | 2026-04-24 |
| Dynamic Trees - TFC Community Edition | NeoForge | 1.21.1 | Client and server | 2026-07-20 |
Questions
Does Alex's Caves need Citadel?
Does the server need Alex's Caves installed?
Which game versions does this port support?
In the catalog
Alex's Caves (Unofficial Port) is one of 8,515 World generation mods on ModsFinder, and one of 4,175 World generation mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
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What the author says
About This Port: This port updates Alex's Caves to work with Minecraft 1.21.1 and the NeoForge mod loader. This is a community-maintained port and is not officially affiliated with the original Alex's Caves developers. Original Mod: Alex's Caves by AlexModGuy and contributors.
Official listing
- Modrinth page
- modrinth.com/mod/alexs-caves-unofficial-port
- Owner
- Raguto
- Published
- 2026-01-04
- Updated on Modrinth
- 2026-04-25
- Facts verified
- 2026-10-15