Answer:
What has a big mouth, yet never speaks?
What do you use to hoe a row, slay a foe, and wring with woe?
My sides are firmly laced about, Yet nothing is withinΝΎ You'll think my head is strange indeed, Being nothing else but skin.
I build up castles. I tear down mountains. I make some men blind. I help others to see.
It can cause deflation of tires when dropped from the rear of spy cars.
Do what he says and you'll be fine, don't and you lose the game.