Answer:
My first is equality; my second is inferiority; my whole is superiority.
Used left or right, I get to travel over cobblestone or gravel. Used up, I vie for sweet success, used down, I cause men great duress.
It's anything but amusing when this body part gets hit.
You can always see it, but it's too far away to touch. Mountains rest on it, and at sea it surrounds you. What is it?
A blind man enters a maze, and the entrance closes behind him. His only way out is to solve the maze. A long time passes, and he exits the maze through the correct exit. How did he solve the maze?
You use it between your head and your toes, the more it works the thinner it grows.