Just thought of this now so here it is:

Use only stone tools
No armor ever!
You may only eat raw meat or zombie flesh
Can only sleep in caves (at least 30 blocks far)
can have only 5 torches or less to use
can only have 10 wood to use (40 wooden planks)
can only use sword, axe, and pickaxe

I call it The Caveman Challenge. try it out!