Answer:
The more of it there is, the less you see.
I am two-faced but bear only one. I have no legs but travel widely. Men spill much blood over me. Kings leave their imprint on me. I have greatest power when given away, yet lust for me keeps me locked away.
You throw me out when you want to use me and you take me in when you don't want to use me. Who am I?
What goes up when the rain comes down?
It's been around for millions of years, but is never more than a month old. What is it?
I can only be played on a windy day
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?