It comprises roots which nobody sees, Much taller than those trees, Up and up it goes, Still it never grows?
I am soft and cuddly that soothe your heart. But, If you pick my last name I am going to tear you all apart. Who am I?
Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?
I don't get anymore wetter, no matter how much rain falls on me.
The more of this there is, the less you see. What is it?
I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?
When my father was 31 I was 8. Now he is twice as old as me. How old am I?
What have one eye but still cannot see?
What breaks yet never falls, and what falls yet never breaks?
Before Mount Everest was discovered, what was the highest mountain in the world?
What is the riddle which can be asked all day with a different correct answer each time.
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.