WorldTweaker
WorldTweaker exposes Minecraft's world generation parameters inside the Create World screen, letting players reshape terrain, climate and blocks before a world is made.
What it does
Instead of relying on hardcoded generation math, WorldTweaker places its controls directly in Create World. Players can adjust the sea level, world height, noise resolution and the shape of the terrain, including amplifying mountain peaks, deepening ocean trenches or flattening the dimension entirely. Climate settings allow temperature, humidity and weirdness bands to be compressed or stretched, which can force biome borders that normal generation would not produce.
The mod also covers blocks and fluids. The underground stone layer can be replaced with other blocks, and oceans can be drained with water swapped for lava. Through a live dashboard, a player can look at and modify the noise routers, density functions and climate parameters that drive generation, and large JSON datapacks can be authored, checked for errors and applied to reshape continents. Installation needs Fabric API, and WorldTweaker runs on client and server, so the server and every player need it. Files are published for Fabric only, for 26.1 – 26.1.2, and the code is open source under the MIT License.
Key features
Terrain shape controls
Sea level, world height, noise resolution and mountain and trench amplitude are set on the Create World screen.
Climate band adjustment
Temperature, humidity and weirdness bands can be compressed or stretched to force unusual biome borders.
Block and fluid swapping
The underground stone layer can be replaced with other blocks, and water can be swapped for lava across oceans.
Live generation dashboard
Noise routers, density functions and climate parameters can be viewed and changed in real time.
Datapack editing
Large JSON datapacks can be written and debugged to change continent sizes and other generation values.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Custom survival worlds
Players can shape terrain and biome layout when creating a world, for example by flattening the dimension or draining the oceans.
Experimental servers
Server owners can set unusual generation rules, such as mixed fluids or altered sea levels, for a shared world.
Who it’s for: WorldTweaker suits players who want full control over world generation, and server owners testing unusual terrain. Its settings can change the world sharply, so it is better used on new worlds.
Questions
Does WorldTweaker need Fabric API?
Does the server need WorldTweaker?
Which game versions does WorldTweaker support?
In the catalog
WorldTweaker is one of 7,555 Cursed mods on ModsFinder, and one of 4,235 Cursed mods for Fabric. 15,189 mods support Minecraft 26.1.2.
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What the author says
WorldTweaker rips out Minecraft's hardcoded world generation math and puts it directly on your Create World screen. No more writing and debugging massive JSON datapacks just to change continent sizes. You get a real-time dashboard to manipulate the game's underlying noise routers, density functions, and climate…
Official listing
- Modrinth page
- modrinth.com/mod/worldtweaker
- Owner
- UDPSendToFailed
- Published
- 2026-04-10
- Updated on Modrinth
- 2026-04-10
- Facts verified
- 2026-10-15