It was only recently added I think. I’m still trying to find how to turn on experimental z levels lol
Edit: I found out where it’s located to turn on but I want it in an existing game. hmmm
Edit 2: Fixed it. For anyone wondering how, find your cdda folder go into save then the world name you wish to turn it on for. Find “worldoptions” in the folder and open in note pad or some other text document. Change “name”:“ZLEVELS”,“value”:“false”} to “name”:“ZLEVELS”,“value”:“true”} and save, Restart the game. Make sure to back up the file before hand just in case.