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

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

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 ?

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

What makes this number unique: 8,549,176,320?

What will you call your mother's brother's brother-in-law?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.