In this challenge world, you spawn in flatlands with a house, a small ore field, a villager trading post, a farm, a very hard mob house, and some trees.

The mob house includes:
Diamond Sword
Bow
64 Arrows
Zombie Pigmen
Zombies
Spiders
Skeletons

The house includes:
Chest with stuff
Enchantment table
Jukebox
Brewing Stand
Furnace
2 Beds
Crafting Table
Map
2 Item Frames with Swords
Counter (Stone Slabs)
Sink ( Cauldron)

Other Structures:
2 by 2 lava and water holes.
Rails around the site.
Train Station made of stone, brick, and glowstone.
Ore field.
Trees. 3 of each kind.

Let me know if I should add/change/exclude anything in my next version!