You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

One day Jenifer meets the Lion and the Tiger in the Forest of Forgetfulness. She knows that the Lion lies on Mondays, Tuesdays, and Wednesdays, and tells the truth on the other days of the week. The Tiger, on the other hand, lies on Thursdays, Fridays, and Saturdays, but tells the truth on the other days of the week. Now they make the following statements to Jenifer:

Lion: Yesterday was one of my lying days.

Tiger: Yesterday was one of my lying days too.

What day is it?

You need to move three matchsticks to form three squares. Can you do it?

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

There is a place where if I stand up straight, I will still be considered sideways.

What is the fastest way to double your money?

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

Find the last number in the series below:

voN luJ yaM raM ---

Replace the question mark with the correct number.