








One Chunk Blocks turns world generation into a chunk-by-chunk block mosaic.
After terrain and features are generated, each chunk is assigned one deterministic block from a large palette. Most solid blocks inside that chunk are then replaced with that chosen block, so one chunk may become stone, another may become quartz, another may become obsidian, copper, terracotta, wood, planks, or many other full blocks.
Gameplay
This mod creates a chaotic and unusual survival world where every new chunk can look completely different from the previous one. It is meant for challenge runs, strange exploration, and worlds that feel unpredictable without fully breaking progression.
Notes
This mod affects newly generated chunks. Existing terrain that was already generated before installing the mod will not be changed.
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.4
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as onechunkblocks-fabric-1.21.4.jar — drop this file into the mods folder
- Download size: 10 KB
- Download link checked 31 Aug 2026 — working
These come from our own check of the pack file, not from the source page.