Vanilla is the original map, with all locations in their original places
Vanilla (shuffled) is the original map, with locations shuffled
Vanilla-Like attempts to randomly generate a map with the same general characteristics of the vanilla map.
Islands generates a series of islands that are connected by caves and bridges
Canyon generates a map with a river going down the middle surrounded by mountains
Caldera generates a mountainous lake that contains a palace.
Volcano places a giant volcano in the middle of the map that contains a palace.
Mountainous maps have pockets of terrain nestled in the mountains that are connected by narrow mountain passes.
Random (no Vanilla) will randomly select the Islands, Canyon, Caldera, Volcano, or Mountainous Biome.
Random (with Vanilla) will randomly select any of the available biomes.