Difficult Brain Teasers
These brain teasers are rated our most difficult.
Title  Detail  Hits  Rating 

Solved by preschoolers in 5 mins  8809 = 6 7111 = 0 2172 = 0 6666 = 4 1111 = 0 3213 = 0... more>>>  
Zebra Puzzle  This was supposedly created by Einstein, and some claim only 2% of the world can solve it.... more>>>  
The Three Knights  During the age of the medieval empires, when knights and barbarians fought against each other, a... more>>>  
Does the water fall or rise  A man rowing a boat in a lake throws his anchor into the waterDoes the water level rise or... more>>>  
The next letter  Which letter should replace the question mark? OZW AO?... more>>>  
I turn polar bears white  ... more>>>  
How would you weigh an aeroplane  A common brain teaser used in some job interviews... how would you weigh an aeroplane without sca... more>>>  
23 Prisoners  A warden meets with the 23 prisoners when they arrive at the prison. He tells them:... more>>>  
One Hundred Coins  You are in a dark room with 100 coins on a table, 12 are heads and the rest are tails, and the tw... more>>>  
Monty Hall Problem  Suppose you're on a game show, and you're given the choice of three doors: Behind one door is a c... more>>>  
