sorry for my bad english, I'm from the Netherlands.this is a survival map I made.
the main change is that stone is replaced with air.

features:
no (cobble) stone
no coal ore
removed iron ore
replaced lapis ore with iron ore
repleaced redstone ore with webs
replaced lava with webs
replaced dirt and gravel with bedrock

there is an end portal with a coulpe chests, these chests contain
stuff that you need to go to the nether.

your goal is, just like in normal survival,to kill the enderdragon and the wither.

challenges:
play without natural regeneration (/gamerule naturalRegeneration false) (not by default)
play without keep inventory (/gamerule keepInventory false) (default)