World Creation
The world creation is accessed clicking new world in Minicraft Plus. There are other options within world creation, world themes, world types and the size (up to 512x512). It does not affect the Underground, Sky World, Dungeon levels, or Structures. When set, it will go into the load game option, which is where worlds will be saved.
World Seed
The world seed is a number used to generate completely random worlds. The player can type any number, letter, symbols, etc. to set the seed, non-numeric seeds are converted into a numeric seed. When creating a world with the same seed, the player will appear in the same world and coordinates. You can set a seed but you cannot get it in the official website.
World Theme
Normal
This is the default theme, contains all biomes.
Plain
Turns the world into a giant, grassy landscape with some Trees here and there.
Desert
Turns the world into a giant Desert with some Trees here and there and populated with Cactus.
Forest
Turns the world into a giant Forest with some Sand patches here and there.
Hell
Oceans are made of Lava instead of Water and also makes the game harder.
World Type
Irregular
Biomes are irregularly shaped and are not balanced very well.
Mountain
Turns the world into a Stone biome with medium water lakes.
Island
Turns the world into an island.