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

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

You are a cab driver who pools passengers. You pick 3 people from a destination and drop 1 after an hour. 2 people climb aboard at the same time and you drop 3 at the next destination. After some time, you pick 2 passengers only to drop 1 after a short distance where 3 more passengers climb up the cab. You leave the rest of the passengers one by one to their destination and then come back home.

Can you tell the eye color of the cab driver?

Can you count the number of squares in the given picture?

Before Mount Everest was discovered, what was the highest mountain in the world?

What Deficiency does the below rebus represent?

VIT_MIN

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?