Adds the world.properties file to each world's save directly! This unique file contains many of the properties found in server.properties, including the ability to set a custom MOTD for a lan world, change the max player count, toggle PvP, set a LAN resource pack, and more fun features!

world.properties is located at: minecraft/saves/world_name/world.properties

Full List of world.properties options:

Toggle flight
Toggle nether
Toggle console broadcast to online operators
Set server difficultly
Toggle command blocks
Toggle entity broadcast range
Toggle force gamemode
Set function permission level
Set gamemode
Set hardcore
Set max players allowed at once
Set max tick time
Set max world size
Set MOTD
Set packet compression threshold (saves resources)
Set online mode (whether usernames are validated or cracked accounts can join)
Set OP permission level
Set idle timeout
Toggle whether proxy connections are allowed
Toggle PVP
Set rate limit (max packets before kick)
Set a custom resource pack
Toggle animal spawns
Toggle monster spawns
Toggle NPC spawns
Set spawn protection size
Toggle chunk write sync

Additionally, if you run the game in such a way that you have console access (i.e. using the command line), your singleplayer worlds will now be capable of receiving command line input and commands! Cool!

Fabric API need not be installed.

World Properties