Answer:
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it, can't see it. What is it?
Blade to blade I always win My foe laid low and even. Yard by yard through thick and thin I'm busiest in season.
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.
I begin and have no end. Eventually I will be the end of all that has begun.
I am a path between high natural masses; remove the first letter to get a path between man-made masses.
A little house full of meat, no door to go in and eat.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic