A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?
How can you take 2 from 5 and leave 4?
I know a nine-letter word having only one vowel. Do you ?
What is more useful when it is broken?
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?
Count The number of F's in the paragraph below: "FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"
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?
What breaks yet never falls, and what falls yet never breaks?
What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?
How many times can you subtract the number 5 from 25?
Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
