How the Prevent Slimes Spawning Option Works in the Bedrock Custom Super Flat Generator

Updated

The Prevent Slimes Spawning option is a checkbox in the Bedrock Custom Super Flat Generator that is meant to keep slimes from appearing in the super flat world you configure. Set it before you generate or copy your world settings, since it is part of the configuration you build in the tool rather than something you change inside Minecraft afterward. The page evidence only shows the option label alongside the other controls, so treat it as a generator-side setting whose exact in-game effect should be confirmed in your own world.

Where the option sits among the generator controls

The generator page presents a compact set of inputs. Based on the page evidence, the visible controls are:

  • A world type selector with options such as Custom Super Flat and Single Biome
  • Add World Name
  • Prevent Slimes Spawning
  • Seed
  • Biome
  • Generate World Name and Seed actions

Because the slime option sits next to the seed and biome fields, it is part of the same settings pass: you choose your world type, name, seed, and biome, decide on slimes, then generate the output.

What the option is intended to do

Super flat worlds are mostly open, lit, and low on terrain features, which is exactly the kind of space where slimes can become a nuisance. The checkbox is intended to stop slimes from spawning in the generated world. In practice, that means:

  • If checked: the generated settings are meant to suppress slime spawning, so you can build or farm without slimes interfering.
  • If unchecked: the generator applies no slime-specific restriction, and slime behavior follows whatever the rest of your settings and the game itself produce.

The tool does not document a mechanism beyond the label, so do not assume it changes terrain, light levels, or mob caps for other mobs. It is a slime-specific toggle.

How to use it in a build

  1. Open the generator and select your world type (for example, Custom Super Flat).
  2. Enter a world name if you want one, and set your Seed and Biome as needed.
  3. Check Prevent Slimes Spawning if slimes are the problem you want to avoid.
  4. Use Generate World Name / Generate Seed to produce the settings.
  5. Apply the generated settings in Minecraft when creating the world.

Expected result: the world is created from the settings you generated, with the slime option included in that configuration.

Common sticking points

  • Setting it too late. If you already created the world, changing the checkbox in the generator will not retroactively edit that world. Decide before you generate and create.
  • Assuming it fixes existing slimes. The option is about spawning in the generated setup, not about removing slimes already present. Existing slimes in a world are a separate matter.
  • Confusing it with the seed or biome fields. The slime checkbox is independent of seed and biome; changing the seed does not substitute for checking the box.
  • Expecting documented guarantees. The page evidence gives only the label, so verify the result in your own world rather than treating the checkbox as a proven, fully documented mechanic.

Choosing whether to check it

Check Prevent Slimes Spawning when your goal is a clean super flat build or farm space and slimes would be an annoyance. Leave it unchecked when you actually want slimes present, for example if you plan slime-based farms or want default mob behavior. Either way, make the choice during configuration, before you generate and create the world.