A simple challenge, with a few surprises mixed in. You're locked in 100x100 box, with nothing but your wits, and a few treasures, to help you along the way. Here's a few challenges to get you started.

-Kill the Ender Dragon
-Build a wither Skeleton farm
-Kill the elder Guardian
-Collect all the dyes
-Build an iron farm
-Obtain a full set of Netherite armor
-Build a gold farm
-Kill all ten named Vindicators
-Obtain a dog, cat, parrot, fox, and panda.
-Get an Elytra
-Find all three enchanted golden apples
-Build a villager trading hall