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?

How do you go from 98 to 720 using just one letter?

What is always in front of you but can’t be seen?

There are two words one resembles the "state of rest" and the other is related to "writing/reading material".

Can you name these two words which also sound similar?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of London.

What breaks yet never falls, and what falls yet never breaks?

What is next number in the pattern below:

131 517 192 123 ?