How many times can you subtract the number two from the number fifty?
There are five vowels (a, e, i, o, u) in the English language. Can you tell us a word that contains all these vowels?
If eleven plus two equals one, what does nine plus five equal?
How many sides does a circle have?
Can you write down eight eights so that they add up to one thousand?
What month of the year has 28 days?
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?
He does not have any heart but still, He manages to live. If you kill him, you will eventually die but yet you kill him. He cannot run, who is He?
My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?
What does the following BrainBat signifies? ABCDEFGHIJKLMNOPQRSTUVWYZ QQQQQQQQQQQQQQQQQQQQQQQQQ.
I am white when I am dirty, and black when I am clean. What am I?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.