If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?
Find the next number in the sequence 1, 2, 6, 21, 88, __?
You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket? (Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)
The more it dries, the wetter it becomes. Can you tell what it is?
If a wheel has 54 spokes, how many spaces are there between the spokes?
Can you find the 09 errors in the picture below?
what one word does the below rebus identifies?
People make me, save me, change me, raise me. What am I?
Can you find out the remainder when 3^300 is divided by 5?
There is so small cabin inside a deep forest. All the forest burned out to worst possible but the inside of the cabin is still the same. However all the person inside the cabin die. How come ?
Which is heavier: a ton of bricks or a ton of feathers?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
