If you say my name, I will no longer exist. What am I?
What is the Surname of Barbie Doll?
How many times can you subtract the number 5 from 25?
In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.
Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?
Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water. How many frogs are there on the log at this moment?
How many sides does a circle have?
What has to be broken before you can use it?
If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?
If an electric train is travelling south, then which way is the smoke going?
Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.