CurseForge · Minecraft mod
One Block!
The One Block mod
Quick answer
Which One Block! release matches 1.21.8 Forge?
One Block! OneBlock 3.3.1 — Forge 1.21.8 targets 1.21.8 with Forge. The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server. All 1 required mods have matching files.
Where it goes
Is One Block! required on the client, server, or both?
The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server.
The source does not explicitly classify this release as client-only or server-only.
What else does One Block! OneBlock 3.3.1 — Forge 1.21.8 need?
OneBlock 3.3.1 — Forge 1.21.8 on 1.21.8 Forge. Every mod below is checked against that same setup.
Install Codxlib first. We found matching files for this game-version and loader setup.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add One Block! without breaking your instance.
Built for One Block! OneBlock 3.3.1 — Forge 1.21.8 on 1.21.8 Forge. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use OneBlock 3.3.1 — Forge 1.21.8. It targets 1.21.8 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Codxlib first. We found matching files for this game-version and loader setup.
- 03
Put it on the correct side
The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server.
- 04
Pick the file you checked
Use the “Get this file” button beside OneBlock 3.3.1 — Forge 1.21.8. It opens that exact file at the source.
About this project
What does One Block! add?
One Block:
Begin your Minecraft adventure in a desolate world with just one respawning block. Break it, level it up, and unlock richer rewards with each upgrade.
The succesful mod / gamemode is now available here at Curseforge!
Installation
- Install your loader for Minecraft
26.1.2(Fabric / Forge / NeoForge). - Put the matching
OneBlock *.*.*jar in yourmodsfolder. - Create a world using
level-type=oneblock:oneblock. - <OPTIONAL> Enable or disable built-in datapacks to toggle: starting island, multiplayer mode, void nether, void end.
Datapack usage by loader (client + server)
All loaders use the same world preset:
level-type=oneblock:oneblock
Built-in pack meanings
...multiplayer= one island slot per player...void_nether= removes Nether terrain...void_end= removes End terrain...no_island= disables initial 3x3 starter island
Fabric (and Quilt)
Singleplayer / client-hosted world
- In Create World → Data Packs, enable:
oneblock:oneblock_multiplayer(optional)oneblock:oneblock_void_nether(optional)oneblock:oneblock_void_end(optional)oneblock:oneblock_no_island(optional)
Dedicated server (server.properties)
- Set:
level-type=oneblock:oneblockinitial-enabled-packs=vanilla,oneblock\:oneblock_multiplayer,oneblock\:oneblock_void_nether,oneblock\:oneblock_void_end,oneblock\:oneblock_no_island
Forge
Singleplayer / client-hosted world
- In Create World → Data Packs, enable:
oneblock:oneblock_multiplayer(optional)oneblock:oneblock_void_nether(optional)oneblock:oneblock_void_end(optional)oneblock:oneblock_no_island(optional)
Dedicated server (server.properties)
- Set:
level-type=oneblock:oneblockinitial-enabled-packs=vanilla,oneblock\:oneblock_multiplayer,oneblock\:oneblock_void_nether,oneblock\:oneblock_void_end,oneblock\:oneblock_no_island
NeoForge
Singleplayer / client-hosted world
- In Create World → Data Packs, enable these built-ins:
mod/oneblock:resourcepacks/oneblock_multiplayer(optional)mod/oneblock:resourcepacks/oneblock_void_nether(optional)mod/oneblock:resourcepacks/oneblock_void_end(optional)mod/oneblock:resourcepacks/oneblock_no_island(optional)
Dedicated server (server.properties)
- Set:
level-type=oneblock:oneblockinitial-enabled-packs=vanilla,mod/oneblock\:resourcepacks/oneblock_multiplayer,mod/oneblock\:resourcepacks/oneblock_void_nether,mod/oneblock\:resourcepacks/oneblock_void_end,mod/oneblock\:resourcepacks/oneblock_no_island
Multiplayer spacing
- Set
oneblock.multiplayerIslandSpacing=<blocks>before first world creation. - If spacing was wrong once, delete the world and recreate it after updating this value.
Tip
If island spacing is wrong, delete the world and recreate it after updating spacing.
Project description from CurseForge.
Pick your setup
One Block! by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.2
2 loader builds26.1.2
3 loader builds26.1.1
3 loader builds26.1
3 loader builds1.21.11
2 loader builds1.21.10
3 loader builds1.21.9
3 loader builds1.21.8
3 loader builds1.21.7
3 loader builds1.21.6
3 loader builds1.21.5
3 loader builds1.21.4
3 loader buildsShowing the newest 12 of 19 game versions. Older files are in the list below.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
One Block! versions and loaders
OneBlock 3.3.1 — Forge 1.21.8
oneblock-3.3.1-forge+1.21.8.jar
1 Aug 2026
Looking for an older file? The official CurseForge project page is in Resources.