What is wrong in the below Picture?

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

Can you move 2 matchsticks to form four equal sized squares.

Nodes are shown below and you need to connect them based on the following rule: Every node can be connected to the number of nodes inside them, i.e. the first node there is a value of 1 which indicates that the first node can connect to exactly one node only.Can you do it?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Which letter of the alphabet has the most water?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?