One Chunk Blocks
by JoraSH10
One Chunk Blocks is a Fabric world generation mod that gives each newly generated chunk a single block palette, so neighboring areas can look completely different.
What it does
Once the terrain features of a chunk are generated, the mod picks one block for that chunk from a broad set of options. The result is a patchwork of single-block chunks that keeps Minecraft beatable.
The mod is meant for players who want a chaotic, unusual survival world where each new chunk looks unlike the previous one. It suits challenge runs and exploration worlds that should feel unpredictable without breaking progression. Only chunks generated after the mod is installed are affected, so terrain created earlier stays as it was.
It runs on the server alone, so players need nothing extra to join. The mod is published for Fabric across 10 release versions, 1.16.5 – 1.21.11, under the MIT License, and is not open source.
Key features
Single-block chunk mosaic
Each generated chunk is turned into a block mosaic, with most solid blocks replaced by one chosen block.
Large deterministic palette
Every chunk receives one block from a large palette, assigned deterministically after terrain features are generated.
Unpredictable exploration
Neighboring chunks can differ sharply, which turns exploration into a series of unfamiliar landscapes.
Only new chunks change
Terrain generated before the mod was installed is left as it was, and only newly generated chunks are affected.
Gallery
Compatibility
Latest build for each game version and loader.
1.21.x3 of 3 versions with builds
1.20.x3 of 3 versions with builds
1.19.x1 of 1 version with builds
1.18.x1 of 1 version with builds
1.17.x1 of 1 version with builds
1.16.x1 of 1 version with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players looking for a chaotic survival world, and server owners who want unusual world generation on a server they run.
How it compares
Random chunks is server-side only, published for 1.21 – 1.21.11 and released under the MIT License, but it is not open source. Skychunk runs on client and server, covers 1.16.2 – 1.21.1 and is open source under the MIT License, so it needs both sides. ChunkMix needs the client, may run without the server, and is released under a Creative Commons license that forbids commercial use and derivatives.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| One Chunk Blocks | Fabric | 1.16.5 – 1.21.11 | Server-side only | 2026-04-19 |
| Random chunks | Fabric | 1.21 – 1.21.11 | Server-side only | 2026-02-08 |
| Skychunk | Fabric and Forge | 1.16.2 – 1.21.1 | Client and server | 2026-08-15 |
| ChunkMix | Fabric | 1.21.1 | Client required, server optional | 2026-04-29 |
Questions
Does One Chunk Blocks change existing terrain?
Which loader does One Chunk Blocks need?
Is One Chunk Blocks playable without it on the client?
In the catalog
One Chunk Blocks is one of 7,555 Cursed mods on ModsFinder, and one of 4,235 Cursed mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from JoraSH10
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What the author says
One Chunk Blocks turns world generation into a chunk-by-chunk block mosaic. After terrain and features are generated, each chunk is assigned one deterministic block from a large palette. Most solid blocks inside that chunk are then replaced with that chosen block, so one chunk may become stone, another may become…
Official listing
- Modrinth page
- modrinth.com/mod/one-chunk-blocks
- Owner
- JoraSH10
- Published
- 2026-04-05
- Updated on Modrinth
- 2026-04-19
- Facts verified
- 2026-10-15