Answer:
I'm as simple as a circle worthless as a leader; but when I follow a group their strength increases tenfold. By myself I'm practically nothing.
I am the noise Santa's reindeers make
I walk on 4 legs in the morning, 2 legs at noon, and 3 legs at night. What am I?
You turn me over after you have traveled far. What am I?
What has keys but no locks a space but no room and you can enter but can't go in?
What language does a billboard speak?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic