This is another superflat preset! Anyone who has played on a Minecraft server before has likely played TNT Run, where you have to run around on TNT that falls when you step on it and last as long as you can. Most servers have this game, if you haven't played before, you should give it a go.

I have made a world where the entirety of the terrain is like the game TNT Run! This isn't useful for much, like the last two presets, but you can play around with it, or cut out an area and, with friends, see who last the longest.

The only downside is that you will end up picking up a lot of pressure plates, but if you type in this command:

/gamerule doTileDrops false

It should stop any items from dropping.

How to Apply:
To get the superflat preset on your own world, simply create a new world, to more options, and change the world type to superflat. Then, click customise, click presets and click ctrl+v to paste at the top of the screen what is below:

3;minecraft:tnt,minecraft:sand,minecraft:stone_pressure_plate;1