Superflat Biome Extension

Superflat Biome Extension

Adds a flat world type with regular biome distribution.

by
1.1K Downloads
fabricworldgen
Rent Server with this Mod

Screenshots

Plains
Woodland mansion
Ocean monument and mushroom island
Badlands
Ice spikes
Lush caves

About this Mod

Make superflat worlds but with all biomes available.

Screenshots

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To use this mod world gen select the Superflat Biome Extension world type in the world creation screen:

World creation

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Several customization option are available:

  • Generate water: makes acquatic biomes generate a layer of water
  • Has features: makes features generate (trees, vegetation, amethyst geodes, etc.)
  • Has structures: makes structures generate (villages, strongholds, etc.)
  • Generate lakes: makes lakes generate (e.g. lava lakes)
  • Generate ores: makes ores generate (this includes underground andesite, diorite, gravel, etc.)

Know issues:

-Ocean monuments generation is inconsistent, sometimes monuments generate at the incorrect height or place their bounding box incorrectly

-It's not possible to use the re-create option with this world type

Planned features:

-Add flat nether and end dimension

This mod is not compatible with other world gen mods, it shouldn't crash but biomes or structures added by other mods may generate incorrectly or not generate at all.

For any problem or suggestion open an issue on github.

Available Versions

Superflat Biome Extension 1.0.0-beta-1 Fabricbeta
MC 1.21.6, 1.21.7, 1.21.8fabric
June 19, 2025

How to Install Superflat Biome Extension on Your Server

1

Order Server

Order a Minecraft Java server with at least 4 GB RAM (6 GB recommended).

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.8).

3

Install Mod

Open the mod browser in the dashboard and search for "Superflat Biome Extension". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.8, 1.21.7, 1.21.6

Server-side

Required

Recommended RAM

6 GB(min. 4 GB)

Frequently Asked Questions

Superflat Biome Extension server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 4 GB RAM is allocated and the loader matches the mod version (1.21.8). You can switch loaders with one click in the panel.

Is Superflat Biome Extension compatible with fabric?

Superflat Biome Extension officially supports fabric for Minecraft 1.21.8, 1.21.7, 1.21.6. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Superflat Biome Extension – how to optimize performance?

Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if Superflat Biome Extension consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install Superflat Biome Extension with just one click on your server.

Recommended RAM
6 GBab €12/mo
Min. 4 GB | +1 GB pro 5 Spieler
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NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Required

Supported Versions

1.21.81.21.71.21.6