A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?
I have a hole in my back and legs I lack. I live where I can’t breathe and I eat without teeth. What am I?
How many times can you subtract the number two from the number fifty?
Give it food and it will live; give it water and it will die.
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?
The more of this there is, the less you see. What is it?
Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask. Who are these two masked girls?
Do You See It?
How can you write nineteen in a manner that if we take out one, it becomes twenty?
Can you find the missing piece of the Porsche?
If you say my name, I will no longer exist. What am I?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
