Answer:
Do what he says and you'll be fine, don't and you lose the game.
Round as a button, deep as a well. If you want me to talk, you must first pull my tail.
A building where people and stories are on stage
It is weightless, you can see it. If you put it in a barrel it will make it lighter?
My first is in fish but no in snail. My second is in rabbit but no in tail. My third is in up but not in down. My fourth is in tiara but not in crown. My fifth is in tree you plainly see. My whole a food for you and me.
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?