Answer:
In the land of the green glass door there are riddles but no answers, sheets but no blankets, and books but no words. Name something found in the land of the green glass door.
What has four legs during the day; and six or eight during the night?
You need a key to receive an answer from me. The answer you'll find is straight from your mind. What is it?
I cost no money to use, or conscious effort to take part of. And as far as you can see, there is nothing to me. But without me, you are dead.
So cold, damp and dark this place. To stay you would refrain, yet those who occupy this place do never complain.
I am your mother's brother's only brother in law. Who am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?