Answer:
What kind of table has no legs?
What has roots as nobody sees, is taller than trees. Up, up it goes, and yet never grows?
What does everyone know how to open but not how to close?
You must keep this thing. Its loss will affect your brothers. For once yours is lost, it will soon be lost by others.
If I have it, I don't share it. If I share it, I don't have it. What is it?
What sphinxes employ and players enjoy.