What goes up but never comes down?

Look at the picture and find out which square is not linked with any of the other squares.

What runs around the whole yard without moving?

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

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

Find the missing letter in the last circle logically in the given below picture.

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?

In which direction should the missing arrow point?

What do you call a fish without an eye?