Do you find Superflat too easy? Try this!
There are no grass, dirt or bedrock layers in the Overworld. The Overworld is just the structures you would find in the Classic Flat preset if your world was generated in 1.17 or later.
Due to technical limitations, Strongholds and Mineshafts generate lower in the world than an upgraded Classic Flat world. Village paths are still at Y-level 4, though.
In 1.21+ worlds, you will automatically be teleported to a dirt path in a village, which will be set as your spawnpoint.
In 1.20.x worlds, starting in Creative is recommended to set spawn at a village, as most of the time you'll spawn above the Void and end up in a death loop. You could also use a mod for this if you're brave enough to try Hardcore!
Created by Klinbee, TechHeadFred and TheFantasticSoap to give players a way to generate a Skyflat-style world in modern Minecraft versions without the lag caused by falling sand/gravel/concrete powder/anvils or decaying leaves.
Unfortunately, we weren't able to bring back Axolotls spawning in any biome as well, you'll have to manually make a world in 1.17 or 1.17.2 for them!