Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?
How is a fly different from a mosquito?
A father's child, a mother's child, yet no one's son. Who am I?
Which is heavier: a ton of bricks or a ton of feathers?
If 2 workers can complete painting 2 walls in exactly 2 hours. How many workers would be needed to paint 18 walls in 6 hours?
I am lying and I always lie. Tell me whether I am lying or telling the truth.
Can you find the missing number in the third row? 35 20 14 27 12 18 5 2 ?
Take one out and scratch my head, I am now black but once was red. What am I?
Which tank will fill first?
What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?
What word is represented by this rebus?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
