How can you take 2 from 5 and leave 4?

A letter is hidden in the image in plain sight. Can you spot it in 6 seconds? Test your eye power now!

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

What is more useful when it is broken?

In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.Can you place 8 queens on the board in a manner that none of the queens can attack each other?

You are trapped in a room with two doors. One leads to certain death and the other leads to freedom. You don't know which is which.
There are two robots guarding the doors. They will let you choose one door but upon doing so you must go through it.
You can, however, ask one robot one question. The problem is one robot always tells the truth, the other always lies and you don't know which is which.
What is the question you ask?

Where do fish keep their money?

Count the number of lines in the image below ?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Find the last number in the series below:

voN luJ yaM raM ---