Hard Riddles for Adults Who Want a Brain Burn

I can be cracked, made, told, and played. What am I?

I am not alive, yet I grow; I do not have lungs, yet I need air; I do not have a mouth, yet water kills me. What am I?

What has to be broken before you can use it?

What five-letter word becomes shorter when you add two letters to it?

The more you take, the more you leave behind. What are they?

What disappears as soon as you say its name?

I have keys but open no locks, space but no room. You can enter, yet you cannot go outside. What am I?

What has cities with no buildings, rivers without water, and forests without trees?

I am taken from a mine and shut up in a wooden case. I never see the sun but help others to see. What am I?

You can find me in Mercury, Earth, Mars, Jupiter, but not in Venus or Neptune. What am I?

A man describes his daughters saying, 'They are all blonde, but two; all brunette, but two; and all redheaded, but two.' How many daughters does he have?

What begins with an E, ends with an E, but usually contains only one letter?

I am always hungry, must always be fed, but if you give me water I soon will be dead. What am I?

Take one out and scratch my head, I am now black but once was red. What am I?

I am the beginning of everything, the end of everywhere, the beginning of eternity, and the end of time and space. What am I?