Easiest way to install custom Minecraft maps (Java Edition) 1.) Download the map that is going to be installed.

Java Edition players can also download the custom backrooms map (Image via Sportskeeda) Various custom worlds have the Backrooms map created in them. If you don't want to mod a whole game version ...

Java Edition users of Minecraft will need Java installed. After doing that, you’ll need to download the version of Minecraft Forge that matches your server version.