CurseForge · Minecraft mod
Local Difficulty Utilities
Fixes local difficulty display on the client and syncs inhabited time from the server. Includes configs and commands to easily edit a chunks local difficulty.
Quick answer
Which Local Difficulty Utilities release matches 1.21?
Local Difficulty Utilities 1.0.1+1.21 targets 1.21, 1.21.1 with Fabric. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.
Where it goes
Is Local Difficulty Utilities required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does Local Difficulty Utilities 1.0.1+1.21 need?
1.0.1+1.21 on 1.21. Every mod below is checked against that same setup.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add Local Difficulty Utilities without breaking your instance.
Built for Local Difficulty Utilities 1.0.1+1.21 on 1.21. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 1.0.1+1.21. It targets 1.21, 1.21.1 with Fabric; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside 1.0.1+1.21. It opens that exact file at the source.
About this project
What does Local Difficulty Utilities add?
Local Difficulty Utilities
Local Difficulty Utilities is a lightweight utility mod that:
- Fixes the client-side display of local difficulty.
- Syncs each chunk's inhabited time value from the server, so the client sees the real difficulty.
- Adds commands to view and edit the inhabited time of chunks.
- Provides configurable options for debugging, syncing, and modifying local difficulty values.
Commands
/ldu inhabited chunk get <target>
Displays the inhabitedTime value of the target chunk.
/ldu inhabited chunk set <target> <time>
Sets the targets inhabitedTime value.
/ldu inhabited region <x1> <z1> <x2> <z2> <dimension> <time>
Sets all loaded chunks inhabitedTime values in-between the two coordinates at once.
/ldu inhabited cancel
Cancels any ongoing region commands.
Config
restoreLocalDifficultly: true
If true, the Local Difficulty entry in the F3 debug menu will be re-enabled so you can see the local difficulty and the day values. If the server doesn't also have this mod with inhabitedTime syncing enabled, then the local difficulty value will be wrong due. The day value will always be correct.
syncInhabitedOnF3: true
If true, the server will respond to chunk sync requests when the client has the F3 debug menu open.
syncInhabitedOnNewChunk: true
If true, the server will respond to chunk sync requests when the client enters a new chunk.
regionMaxChunks: 250001
This is the maximum amount of chunks that can be edited at once with the region command.
regionBatchSize: 100
This limits how many chunks the region command will try to edit per tick.
Other Information
- The
regioncommand will only select and edit chunks that are loaded into the game's memory. - This mod can be used on servers without this mod, but the client won't be able to get display the correct local difficulty because it doesn't have access to the needed information.
Requirements
- Fabric API
- Cloth Config
- ModMenu
Project description from CurseForge.
Pick your setup
Local Difficulty Utilities by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.4
1 loader build1.21.3
1 loader build1.21.2
1 loader build1.21.1
1 loader build1.21
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Local Difficulty Utilities versions and loaders
1.0.1+1.21
ldu-1.0.1+1.21.jar
25 May 2025
1.0.0+1.21
ldu-1.0.0+1.21.jar
23 May 2025
Looking for an older file? The official CurseForge project page is in Resources.