Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

In the following series, a set of numbers is progressing with a particular pattern. Can you deduce that pattern and find the missing set?

(2 + 6), (21 + 6), (58 + 6), (119 + 6), ___

Imagine you are in a room with no windows or doors. How will you get out?

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

Using eight eights and addition only, can you make 1000?

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