Scratch

CAVEMAN

Your challenge, to live as a caveman would for as long as possible.
This means:

-No farming
-No tools better than stone,
-No armor better than leather,
-Play on HARDCORE,
-No mining (apart from stone),
-No crafting(apart from tools, workbenches and furnaces),
-No setting up a freestanding shelter, you are only allowed to make base in a cave.
-Never stay in one place for more than one night.
-If possible, use the Balkons Weapons mod, to be able to get spears, javelins and such.

I say farming as creating a farm. You're allowed to smash sugarcane, as long as you don't replant it. No melons for you!

Any additional ideas will be considered!