Random Layer Chunk
by Cheaz
Random Layer Chunk reduces the whole world to a single chunk, with randomly arranged block layers that keep growing downward and vertically upward over time.
What it does
Players start with grass, wood, stone and a watch, and the world is confined to one chunk. Each in-game day a new layer of random blocks appears beneath the feet, so the vertical space grows steadily as the days pass. Loot chests appear every 10 days with useful items, and mobs change over the cycle: peaceful mobs during the first 5 days and hostile mobs during the 3 nights that follow. A random-colored bed is placed in the center of the chunk, and sleeping in it skips the night as usual.
Players join without installing anything, since only the server runs the mod. Dynamic Height is required, and Sodium is incompatible. Files are published for Fabric only, for 1.21.1, with 1.0.2 as the latest file, released under the MIT License as open source. Every option is set in a config file, including layer count, chunk position and block filter, and the gamerule randomchunk can switch the mod on or off. Commands reload the config, reset the layer height, or force a chunk to be created with a teleport to it.
Key features
Daily layer growth
A new band of random blocks appears below the chunk each day, so the vertical space keeps expanding.
Time control
A speed-time setting accelerates the clock, and surviving 100 days earns the 100 Days Chunk advancement with 1000 XP.
Automatic pick-up
Broken blocks go straight into the inventory, so mining does not leave items on the ground.
Config and commands
Layer count, chunk position and block filter can be changed in the config file, with commands to reload, reset or initialize the chunk.
Gallery
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
Incompatible 1
Use cases
Compact survival challenge
Players who want a tightly limited world can start from one chunk and build upward as each day adds new layers.
Content creation
The daily layers and changing mob phases give creators a fresh situation every session.
Who it’s for: Players who enjoy a small, unpredictable survival challenge, and server owners who want to host it. Only the server needs the mod.
How it compares
Every Random Chunk is server-side only, released under the MIT License, and published for 1.21.11. Random Block Chunk runs on client and server under the MIT License, with files for 1.21.10. Random Layer Chunk is for 1.21.1 and is open source, while Random chunks spans 1.21 – 1.21.11 and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Random Layer Chunk | Fabric | 1.21.1 | Server-side only | 2026-08-10 |
| Every Random Chunk | Fabric | 1.21.11 | Server-side only | 2026-07-06 |
| Random Block Chunk | Fabric | 1.21.10 | Client and server | 2025-11-26 |
| Random chunks | Fabric | 1.21 – 1.21.11 | Server-side only | 2026-02-08 |
Questions
Does Random Layer Chunk need Dynamic Height?
Does a player need the mod to join a server?
Can the mod run with Sodium?
Which game version does the mod support?
In the catalog
Random Layer Chunk is one of 7,555 Cursed mods on ModsFinder, and one of 4,235 Cursed mods for Fabric. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
This mod turns your Minecraft world into a single chunk challenge. Every in-game day, new random layers of blocks appear beneath your feet, creating an ever-growing vertical world. Start with grass, wood, and stone, then watch as new layers, loot, and mobs emerge. Perfect for a compact survival challenge.
Official listing
- Modrinth page
- modrinth.com/mod/random-layer-chunk
- Owner
- Cheaz
- Published
- 2026-08-10
- Updated on Modrinth
- 2026-08-10
- Facts verified
- 2026-10-15