What brings you down but never up?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Can it be possible to build a house that has all its four walls facing towards the South?

Find the number of squares in the below picture

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

ENEMY = 2 * LINK
LINK + 2 = HELL

Then what will be TAXI + HELL? Select from the options below:
a) ROTTEN
b) DANGER
c) HEAVEN
4) MORTAL

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes