Minecraft wiki entry for Realms, associated text: Users can choose to temporarily replace their world with a Minigame or permanently replace their world with maps from the following categories: World templates, Adventures, Experiences, or Inspiration. Most commands or options cannot be used while the realm is running a minigame. These maps are selected from community submissions by the Minecraft Content Team. Certain maps may not be available on Realms due to being phased out or incompatible with the current update. Users cannot delete a map, but they can reset it.