Random Block World
by cjcameron92
Random Block World changes how new terrain is generated, replacing most blocks with random ones on Fabric for 1.21.10 – 1.21.11.
What it does
Random Block World changes world generation so that nearly every block is swapped for another random block, turning familiar terrain into something unpredictable and more challenging. Certain critical blocks are excluded from randomization, keeping the game playable and progression intact. Strongholds and the mob mechanics tied to the End keep working, because End Portal Frames and Spawners are never randomized and always appear where vanilla places them. The mod runs on the server side only, so players join without installing it. Files are published for Fabric, for 1.21.10 and 1.21.11, under the MIT License, and the mod is not open source.
Key features
Randomized block generation
Worlds created with the mod have most of their blocks replaced with other random blocks during generation.
Protected progression blocks
The End Portal Frames and Spawners stay unrandomized and generate as usual, which keeps strongholds and End mob mechanics functional.
Familiar terrain turned unpredictable
Known landscapes become harder to read, since surface and underground blocks can change into unexpected types.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Random chunks is a Fabric, server-side only mod under the MIT License, with files for 1.21 – 1.21.11. Random Mob Challenge is a Fabric mod for 1.21.11 that runs on the client and server and uses a custom license.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Random Block World | Fabric | 1.21.10 – 1.21.11 | Server-side only | 2026-01-29 |
| Random chunks | Fabric | 1.21 – 1.21.11 | Server-side only | 2026-02-08 |
| Random Mob Challenge | Fabric | 1.21.11 | Client and server | 2026-03-16 |
Questions
Does Random Block World need to be installed on the client?
In the catalog
Random Block World 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.
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What the author says
This mod completely changes how Minecraft worlds generate by randomizing nearly every block in the game. When a world is created, blocks are replaced with other random blocks, turning familiar terrain into something unpredictable and challenging. To keep the game playable and progression intact, certain critical…
Official listing
- Modrinth page
- modrinth.com/mod/randomblocks
- Owner
- cjcameron92
- Published
- 2026-01-29
- Updated on Modrinth
- 2026-01-29
- Facts verified
- 2026-10-15