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.

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Count the number of triangles in the below picture?

Can you find out the number of the parking space in which the car is parked?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

What is the largest number you can write with just 3 digits?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?