Easiest
Easy
Medium
Difficult
Impossible
100

What has keys but can't open locks? 

A piano

100

What has a neck but no head? 

A bottle

100

I'm not alive, but I can grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

A fire

100

Can a man legally marry his widow's sister in the state of California?

NO since she is a 'widow', the guy's dead!

100

Given one, you'll have either two or none?

a choice

200

I'm tall when I'm young and short when I'm old. What am I?

A candle 

200

I speak without a mouth and hear without ears. I have no body, but I come alive with wind. What am I?

An echo

200

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

Pencil lead/ graphite 

200

What kind of candy would a prisoner want before he is executed?

A Life Saver

200

 Lighter than what I am made of, More of me is hidden Than is seen. What am I?

An iceberg 

300

What has a head, a tail, is brown, and has no legs? 

A penny
300

The more you take, the more you leave behind. What am I?

Footsteps

300

I'm light as a feather, yet the strongest person can't hold me for much longer than a minute. What am I?

Breath

300

What do you call a bear with no teeth?

A gummy bear

300

What was never scared but became petrified, can't make a bird but can make a bat, can't live in a house but would die to have one. What is it?

A tree

400

What has hands but can't clap?

A clock

400

What runs all around a backyard, yet never moves?

A fence 

400

What can travel around the world while staying in a corner? 

A map

400

Only one color, but not one size, Stuck at the bottom, yet easily flies. Present in sun, but not in rain, Doing no harm, and feeling no pain. What is it?

A shadow 

400

I'm found in the sea and on land but I can't walk or swim. I travel by foot but I'm toeless. No matter where I go I'm never far from home. What am I?

a snail

500

What comes once in a minute, twice in a moment, but never in a thousand years? 

The letter M

500

What has keys but can't open locks, space but no room, and you can enter, but you can't go inside? 

A keyboard 

500

What did one math book say to the other math book?

Do you want to hear my problems?

500

 It can't be seen, can't be felt, can't be heard, and can't be smelt. It lies behind stars and under hills, And empty holes it fills. It comes first and follows after, Ends life, and kills laughter. What is it?

The dark

500

Different lights do make me strange, thus into different sizes, I will change. What am I?

I am the pupil of an eye.

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