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Chunk Randomizer (Sulfur Update)
Every chunk you visit is randomized to a new blocktype!
Explore the world..
.. defeat the ender dragon.
Important: Run /rc start in chat to start the challenge. Chunk randomization only begins after this command.
🛠 Basic Commands
| Command | Description |
|---|---|
/rc start |
Activate the challenge. |
/rc stop |
Pause the challenge. |
/rc effects |
Toggle potion effects (Default: false) |
/rc fluids <true/false> |
Toggle: Should Water, Lava and Fire be randomized? (Default: false) |
/rc exclude add <block> |
Add a block to the custom blacklist |
/rc exclude clear |
Reset your custom blacklist |
/rc debug <0-3> |
Toggle debug messages for protection, blocks, and effects. |
💡 Pro Tips & Customization
- Use /rc exclude add minecraft:... to prevent a chunk from turning into a lag-fest.
- Chunk Walker Boots: They protect you from all world-randomization and effects, but they lose 10 durability per chunk.
- Status effects/curses are disabled by default. Enable or disable them using
/rc effects. Active chunk effects are removed immediately when you leave the chunk, use Chunk Walker Boots, stop the challenge, or disable effects.
Developed by Eckelsoft
How to Install Chunk Randomizer (Mod)
Chunk Randomizer by eckelsoft is verified for Fabric across Minecraft versions 1.20.1, 1.21.10, 1.21.11, 1.21.9, 26.2 (latest release: 2.3.0, file size: 1.5 MB). Follow the steps below to install it safely from ModCraft.tv:
- Click the Download button above and select your Minecraft version (1.20.1, 1.21.10, 1.21.11, 1.21.9, 26.2) and platform (Fabric).
- Make sure you have the compatible loader or environment installed for Fabric.
- Move the downloaded Chunk Randomizer file into your Minecraft
.minecraft/modsfolder and launch the game.
All Versions
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[2.3.0] Chunk Randomizer 2.3.0 — Sulfur Update
by eckelsoft on Jul 17, 2026
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Chunk Randomizer has been fully migrated to Minecraft Java Edition 26.2.
- Highlights**
- Updated to Minecraft 26.2, Fabric Loader 0.19.3, and Fabric API 0.155.2+26.2.
- Built for Java 25.
- Preserves the established gameplay-focused blacklist instead of broadly excluding interesting blocks.
- Adds the new Sulfur and Cinnabar stairs, slabs, and walls to the blacklist.
- Excludes Potent Sulfur, Sulfur Spike, and Golden Dandelion because mass placement causes problematic behavior or severe lag.
- Keeps the existing /rc commands, Chunk Walker Boots, optional chunk effects, fluid setting, and custom session exclusions.
- Includes regression tests for the migrated block candidate pool.
[2.2.0] Chunk Randomizer 2.2.0
by eckelsoft on May 12, 2026
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[VERSION] Modrinth VERSION 2.2.0
Update chunk effects and remove monster/timer Features
Update chunk effects and remove monster/timer Features
- Remove surprise monster spawning and related /rc spawnmonster commands
- Remove action bar timer and timer/reset commands
- Set /rc effects default to false
- Make chunk effects non-stacking and clear them on chunk changes, stop, disable, or Chunk Walker protection
- Keep start/stop, fluids, chunk replacement, blacklist, debug, and Chunk Walker behavior
- Bump mod version to 2.2.0
- Update README with current commands and /rc start requirement
[2.1.1] ChunkBlockMod 2.1.1 Hotfix
by eckelsoft on Apr 28, 2026
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### Fixed
### Changed
- Fixed a crash on Minecraft 1.21.11 when joining a world.
- Removed a direct command permission API call that changed between Minecraft 1.21.9 and 1.21.11.
### Changed
- Updated the build target to Minecraft 1.21.11 while keeping the published compatibility range for 1.21.9-1.21.11.
fabric.mod.jsonnow uses the Gradle project version instead of a hardcoded version.- Cleaned up duplicate metadata in
fabric.mod.json.
[2.1.0] Chunk Randomizer 2.1.0
by eckelsoft on Mar 02, 2026
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v2.1.0 - No walls & no stairs update!
[VERSION] Modrinth VERSION 2.1.0
🌪 Dynamic Chunk Effects
Duration Update: Effects are no longer a flat 30 seconds. They now last randomly for either 8 seconds or 16 seconds.
🚫 Performance & Exclude System
If you encounter blocks that cause lag (like certain modded blocks or complex entities), you can now exclude them in real-time.
Use /rc exclude add minecraft:... to prevent a chunk from turning into a lag-fest.
[VERSION] Modrinth VERSION 2.1.0
- added all walls and stairs blocks to the blacklist
- added commands for custom blacklist blocks and clearing
- reduced effects durations from 30s to 8-16s
🌪 Dynamic Chunk Effects
Duration Update: Effects are no longer a flat 30 seconds. They now last randomly for either 8 seconds or 16 seconds.
🚫 Performance & Exclude System
If you encounter blocks that cause lag (like certain modded blocks or complex entities), you can now exclude them in real-time.
Use /rc exclude add minecraft:... to prevent a chunk from turning into a lag-fest.
[2.0.2] Chunk Randomizer 2.0.2
by eckelsoft on Jan 27, 2026
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WHATS NEW?
- New Mod LOGO
- Configure Fluids replacement (/rc fluids <true|false>)
- Set spawnMob maximum to 1-8 (from 1-16)
- Version 1.21.9 to 1.21.11 tested
[2.0.1] Chunk Randomizer 2.0.1
by eckelsoft on Jan 10, 2026
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[HOTFIX] v2.0.1 - Instant-Effects now only tick once (Instant Damage will no longer kill you directly)
[TASK] Improved logging (/rc debug <loglevel>)
[TASK] Improved logging (/rc debug <loglevel>)
[2.0.0] Chunk Randomizer 2.0.0 (Chaos Update)
by eckelsoft on Jan 09, 2026
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## 🚀 The Chaos Update
- Lava**: Chunks can now be replaced entirely by **Lava**
- TNT Hazards**: Watch your step—TNT blocks can now appear as part of the random landscape
- Random Effects**: Get hit with anything from **Strength V** to **Instant Damage III**.
- Stacking Chaos**: Effects refresh and stack as you move, forcing you to choose your path wisely.
- 👾 Surprise Spawns** From a harmless flock of chickens to a world-ending **Wither** or a stealthy **Warden**.
- Version 1.21.11 Features like Spear & Mace Meta, Copper**
- see more in README.md
[1.1] Chunk Randomizer 1.1
by eckelsoft on Oct 30, 2024
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- VERSION:** v1.1
``
[TASK] Updated exclusion list to reduce lags
[TASK] Add logo and preview image to the repository
[TASK] Improved logging
[1.0.1] Chunk Randomizer v1.0.1
by eckelsoft on Oct 27, 2024
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Modrinth Project: https://modrinth.com/project/chunk-randomizer/
Full Changelog: https://github.com/eckelsoft/ChunkBlockMod/commits/v1.0.1
Full Changelog: https://github.com/eckelsoft/ChunkBlockMod/commits/v1.0.1
