Name a key which is hardest to turn.

In a secret society, a buried chamber can be accessed only via a secret password. The password is seven characters long and comprises of just letters and numbers.

You find a code that can help you in cracking the password. The code says "You force heaven to be empty".

Can you deduce the password from that?

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

Find out the missing number in the picture attached:

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

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

What you cannot hold but it is yours?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

John is the son of Jacob.
So,
Jacob is the_____of John's father?