Answer:
What can go through glass without breaking it?
The eight of us move forth and back. To protect our king from the foes attack.
What is that you will break everytime you name it?
Do what he says and you'll be fine, don't and you lose the game.
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?