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?

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

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Replace the question mark with the correct number in the below-given picture?

What is the end of everything?

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains the same digits only.

Can you find that number?

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

Find the smallest sentence with all the English alphabet.

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?