Can you count the number of lines in the below picture?
Nine marbles are arranged in the image below. Can you slide two marbles to form a square?
What does a man do only once in his lifetime, but women do once a year after they are 29?
I am not a bull but I have horns. I am not an ass but I have a pack saddle. Wherever I go, I leave silver behind me. Who am I?
What can jump higher than a building?
In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat. Can this even be possible?
No matter how little or how much you use me, you change me every month. What am I?
What is the next number in the series? 15 29 56 108 208 ?
What three numbers, none of which is zero, give the same result whether they’re added or multiplied?
With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. 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?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
