Name a key which is hardest to turn.

Find the hidden tiger in the given optical illusion ?

Count the number of squares in the picture below.

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

Can you place six X (crosses) in below board without making three in a row in any way ?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

I don't get anymore wetter, no matter how much rain falls on me.

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?