Answer:
Snake coiled round and round. Snake deep below the ground. Snake that's never had a head. Snake that binds but not with dread.
I never was, am always to be. No one ever saw me, nor ever will. And yet I am the confidence of all, To live and breath on this terrestrial ball.
Slayer of regrets, old and new, sought by many, found by few.
I can be written, I can be spoken, I can be exposed, I can be broken.
A nut cracker up in a tree.
I can only be played on a windy day
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?