On: Witchcraft and Wizardry – RPG game created in Minecraft

[pault]

Are these worlds created in-game or using an external editor?

[DylanDmitri → pault]

Large scale terraforming (land masses, forests, mountains, rivers) is done via external tools. Most "human scale" features like buildings are done in-game.

[Gaelan → pault]

Generally speaking, in game, but with mods (such as WorldEdit[0]) that provide tools for copy/paste, quickly filling large areas, etc.

[0]: https://www.curseforge.com/minecraft/mc-mods/worldedit