Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Name a key which is hardest to turn.

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

A boy was driving a car, a girl took a lift from her. She asked his name. The boy said - my name is hidden in my car’s number, find it if you can. After this, she got down Car number was [ WV733N ] Can you guess the name now?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

How can you make number one disappear by adding something to it?

Can you solve the rebus below?