Answer:
Flat as a leaf, round as a ring. Has two eyes, can't see a thing.
They try to beat me, they try in vain. And when I win, I end the pain.
What has 4 legs in the morning, 2 legs in the evening and 3 legs in the night?
You can spin, wheel and twist, but this thing can turn without moving. What is it?
What is the smallest bridge in the world?
People take me on walks and I run and have fun. What am I?