This Minecraft map makes this usually simple sandbox game much harder.
It features:
Modified mobs like zombies, creepers, skeletons
Random teleportion so you can replay once you (inevitably) die
Ultra Hardcore (no natural regen) option
Play in singeplayer, on a team in multiplayer, or try to outlast your friend!
No mods or datapacks needed! Just put the world in your Minecraft saves folder and enjoy.
Have fun, and don't (or try not to) die!
ps. there's an extra surprise housed within the creepers