What has a ring but no finger?

You can hear me, but you can't touch or see me.

What am I?

Why is 6 afraid of 7?

Why is the Hole below a Lock?

A man desired to get into his work building, however he had forgotten his code.
However, he did recollect five pieces of information
* Fifth number + Third number = 14
* The fourth number is one more than the second number.
* The first number is one less than twice the second number.
* The second number and the third number equals 10.
* The sum of all five numbers is 30.

What is the code ?

Find the value of "?" in the ball picture Riddle below:

Forwards I am heavy, backward I am not. What am I?

I am quite hot but become too cold if you remove the first two letters. What am I?

Which word does the below Plexor means ?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?