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In order to create a Superflat world in a multiplayer server, the level-type flag in server.properties must be flat, instead of default. In Java Edition 1.16 and after strongholds do not generate naturally in a default superflat world but in Java Edition 1.15.2 and prior they can, requiring either a world in 1.15.2 to be updated to 1.16 after world creation or a custom superflat preset to generate strongholds naturally while still receiving the features of the Nether Update. Superflat worlds also allow the player to access The End, which generates a normal dimension of floating islands, if strongholds are enabled, by spawning in an End Portal (block) using commands or by building your own End portal. Superflat worlds allow the player to access The Nether by building a Nether portal in the usual way or by spawning in a Nether Portal (block) using commands. In Bedrock Edition, the player always spawns at X/Z coordinates 0,0. Structures may not fully generate if the topmost layer is too low. When making a Superflat world, the player almost always spawns on the topmost layer and on some block types, within a 20x20 area. Because of the low altitude of the world, slimes spawn frequently. Since the height limit (256) is unchanged, there is almost one-third more vertical height available to build above-ground structures as compared to a normal world. The surface of the world is completely flat and at Y=4, except for villages and other structures if they are enabled. Because the entire world is a plains biome by default, villages generate relatively frequently in Java Edition, while in Bedrock Edition villages do not generate in Flat worlds.
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In a classic (default) Superflat world, the terrain consists of one layer of bedrock, two layers of dirt, and one layer of grass blocks.