1. Fight the Ender dragon with a wooden sword! It’s almost impossible to fight a warden no matter what, especially without armor.
2. 10 zombie-sized chickens! It would be pretty easy.
3. Spend 3 hours in the Nether, because you could just hide or build a base.
4. Regular Minecraft.
5. This is pretty hard, but probably jeb_ because he still works at Mojang, while Notch doesn’t.
6. This is actually easy, test updates.