How to use a custom world seed?
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1. First stop your server. Then Login to your PiglinHost control panel, then click the File Manager tab.

2. Then scroll until you see the 'server.properties' file, click on this.

3. Scroll to the bottom of the file, and add the line level-seed= then your level-seed after the = sign. In the example below, the seed is 123456.

4. Then click the 'Save Content' button in the bottom right.

5. Head back into your File Manager, and then delete the existing world folder. If you want to keep it, then simply rename it to something other than world. Please note you cannot apply a world seed to a existing world. In the example below, we are just going to delete it.

6. Then simply start your server up again - it will generate a new 'world' with the seed you have specified!