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 parameters.

Here is exactly what you can control:

Terrain & Shape: Adjust sea level, world height, and noise resolution. Amplify mountain peaks, deepen ocean trenches, or completely flatten the dimension.
Biome Climate: Compress or stretch the temperature, humidity, and weirdness bands to force impossible biome borders.
Density & Transforms: Apply raw mathematical transforms (Absolute Value, Square, Cube, Invert) to the density functions. You can literally invert the world's heightmap or force the terrain into rigid grids.
Block & Fluid Swapping: Replace the default underground stone with Glass, TNT, Diamond, or Sculk. Drain the oceans entirely, or replace all water with lava.
Chaos & Skylands: Generate endless floating islands, hollow out the underground into spaghetti-noodle caves, or just hit the Randomize button to scramble every variable to its absolute limit for an instant challenge map.

Performance Warning

This mod gives you full permission to break the engine. If you set the sea level to the sky limit, swap water for lava, and invert the cave density, the game will attempt to process millions of cascading fluid updates the second you spawn. It will absolutely nuke your server thread. You have the power to turn the world generation inside out, but whatever happens to your CPU and frame rate is entirely on you.