ModsFinder

Unstable Generation

by Tsunddere

Unstable Generation, a Fabric world generation mod by Tsunddere, reproduces the landscape progression of the Unstable SMP world in new worlds.

FabricClient and serverAll rights reserved1.21.5 – 1.21.11

What it does

Unstable World Generation copies the terrain generation used on the Unstable SMP, so a new world follows the same landscape order that the SMP is known for. A Great Sea is one of the features that the mod places in the generated world.

Servers that run it need every player to install it too. Files are published for Fabric only, across seven release versions, with 1.0.7 for 1.21.11 as the latest file. The mod is not open source and is licensed as All rights reserved.

The author notes that the mod is meant to work with the current SMP setup, though the exact conditions are not described in detail here.

Key features

  1. SMP terrain replication

    The world generator reproduces the landscape progression of the Unstable SMP in new worlds.

  2. Great Sea generation

    A large body of water named the Great Sea is generated as part of the landscape.

  3. Matched terrain rules

    Terrain generation follows the rules the Unstable SMP uses, so familiar regions appear in the same order.

Compatibility

Latest build for each game version and loader.

1.21.111.0.7
1.21.101.0.7
1.21.91.0.7
1.21.81.0.7
1.21.71.0.7
1.21.61.0.7
1.21.51.0.7
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Use cases

Recreating the SMP world

Players who want a world laid out like the Unstable SMP can generate one with the same landscape order.

Who it’s for: Players who follow the Unstable SMP and want new singleplayer or multiplayer worlds that match its terrain, and server owners who run the SMP style of world.

How it compares

Full comparison

Better Nether Generation is a Fabric mod for 1.18.2 – 1.20.1, server-side only and not open source, so it targets the Nether rather than the overworld landscape. AmpXtreme is server required with optional client, published for Fabric, Forge, NeoForge and Quilt across 1.20 – 1.21.8, and is also not open source. Unstable Generation runs on Fabric only and needs both sides.

ModLoadersGame versionsEnvironmentUpdated
Unstable GenerationFabric1.21.5 – 1.21.11Client and server2026-07-05
Better Nether GenerationFabric1.18.2 – 1.20.1Server-side only2023-07-09
AmpXtremeFabric, Forge, NeoForge and Quilt1.20 – 1.21.8Server required, client optional2025-09-15

Questions

Does Unstable Generation need to be installed on the server?

Yes. Installation covers the server and each player's game.

Which loader does Unstable Generation support?

Only Fabric. Files exist for seven release versions, and the latest one is 1.0.7 for 1.21.11.

In the catalog

Unstable Generation is one of 8,515 World generation mods on ModsFinder, and one of 4,027 World generation mods for Fabric. 19,862 mods support Minecraft 1.21.11.

World generation mods8,515Fabric modsMods for 1.21.1119,862

Similar mods

Biomes O' Plenty1.7.10 – 26.3Terralith1.18.2 – 26.3YUNG's Better Nether Fortresses1.18.2 – 26.1.2Dungeons and Taverns1.19 – 26.3Yeetus Experimentus1.18.2 – 26.3Towns and Towers1.18.2 – 26.3

What the author says

Unstable World Generation Mimics The Unstable SMP's World Terrain Generation.
Tsunddere, on the Modrinth page

Official listing

Owner
Tsunddere
Published
2026-04-13
Updated on Modrinth
2026-07-05
Facts verified
2026-10-15

Tags

World generation
Open on ModrinthCompare