Answer:
I build up castles. I tear down mountains. I make some men blind. I help others to see.
Take one out and scratch my head I am now black but once was red.
I bind it and it walks. I loose it and it stops.
What do you throw out when you need it but put away when you don’t?
What lies in a tunnel of darkness. That can only attack when pulled back?
I have two eyes in the front and a lot of eyes on my tail
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?