You wake up in a unusual world and the only thing you see is stone.You need to survive with the only a few things you get.You get 2 egg spawner of every passive mob, seeds for farming and 3 of every ore.You can still find ore in the ground but only from like 60 to bedrock, they are very low to the ground.Good luck surviving.

Challenges:
1.Build an animal farm!
2.Make a mini ocean for squids!
3.Make a farm!
4.Write a book!
5.Make an infinite snow generator!
6.Make a cobblestone generator!
7.Obtain blue wool!
8.Craft a full set of leather!
9.Craft a full set of iron!
10.Craft a full set of diamond!
11.Make a golden apple!
12.Make a nether portal!
13.Make a cake!
14.Build a small village for the villigers!
15.Build iron golems for the village!
16.Make a brewing stand!
17.Enchant an item.
18.Make a secret door with redstone.
19.Make an automatic farm!
20.Kill the enderdragon!

You can use mods if you want, but I first recommand vanilla.You can still find a stronghold for endportal.
Trailer:https://www.youtube.com/watch?v=9ixVa2lpisI