It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

What is the below Rebus indicate?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

What month of the year has 28 days?

There are two guys standing face to face in a room. On a wall, there is a clock. One of those is a prophet. He tells the other guy that he will be stabbed in the back in five minutes.

Shocked to hear that, the other guy stares at the clock. Just after the five minutes, he is stabbed on the back. Can you tell what happened?

What's the only room from which no one can enter or leave

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Can you start the fire using two pieces of wood?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?