Superflat

The Superflat was first introduced to Minecraft in Snapshot 12w01a. The flatland is a World Type feature named "Superflat". It seems that when you die, your spawn point changes and you spawn far from anything you built. Also, mobs that were in the world aren't in the map when you respawn.

The terrain consists of one layer of bedrock and three layers of dirt; the surface of the world is completely flat and at height y = 4.

Mobs spawn as normal, including slimes; however, there is no “void fog” as would ordinarily be caused by being close to the bottom.

Bugs

 * If one breaks the Bedrock barrier, then one can see that the Void has the same color of the sky when the Player is above y=0, but looks normal (black) when the Player is below y=0.