World type

World Type is an option for World Generation first introduced in Snapshot 12w01a. It allows the player to create worlds of specific type as provided. It currently offers the types Default and Superflat.

Default

 * This was the only available world type until the release of Minecraft 1.1, adding Superflat worlds.

Superflat

 * In Superflat World type, the Void appears sky color from above Y coordinate 0. However, when viewed from below this coordinate, the Void appears it's normal black color. When viewing the Void from above layer zero, it appears the same color as the sky. However, dropping below that will return it to it's normal color of black.
 * Slimes are very common on Superflat worlds, as the ground level is only 4 blocks above the bottom and slimes spawn from layers 40 to the bottom.