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

What 5-letter word typed in all capital letters can be read the same upside down?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

Can you find the key in the picture below?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

What word begins and ends with an E, but has only one letter?