What's the only room from which no one can enter or leave
Can you make four (4) nines (9) equal 100?
Why do Chinese men eat more rice than Japanese men do ?
When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?
A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child. Where's the father?
In the formation, you can see a few arranged matchsticks. Can you form three squares by moving just three matchsticks?
What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?
There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?
I am under you when I am whole. I shift above you if you remove the first letter. I come all around you if you remove the second as well. Can you tell me who I am?
What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?
The centre of the third figure is empty. What digit should fit inside?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
