What kind of storm is always in a rush?
How can you make a TV, a bed, a dog, and a car liquid?
The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?
What is full of holes but still holds water?
Can you solve the photo plexer logic ?
A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was. In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?
I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?
Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.
John was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday. Can you find out on what day was Jacob born?
Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.
What's the next in the series? H, Be, F, S, Mn, Kr, In, Gd, Tl, ?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.