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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
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
