# Critical Thinking Puzzles

## 100 Blue Eyes Puzzle

Puzzle: This puzzle is one of the hardest puzzle in the world. If you are able to solve this, believe me you are genius. A group of people with assorted eye colors live on an island. They are all perfect logicians — if a conclusion can be logically deduced, they will do it instantly. No Read More →

## Secret Mail Problem

Puzzle: A wants to send a secret message to his friend B in the mail. But C (A’s Friend), who A don’t trust, has access to all A’s mail. So A put his message in a box with a lock. But A is not allowed to send a key! How can A send his message Read More →

## Colour of the Bear?

Puzzle: A bear falling from a height of 10m on the ground in square root of 2 seconds. what is colour of bear? We would advise you to think yourself before reading the answer below. Solution: S=(1/2)g(t^2) or g=(2S)/(t^2) So g=10m/s, this is the maximum value of gravity on earth and occurs at the POLES. Read More →

## Camel and Bananas Puzzle

Puzzle:  The owner of a banana plantation has a camel. He wants to transport his 3000 bananas to the market, which is located after the desert. The distance between his banana plantation and the market is about 1000 kilometer. So he decided to take his camel to carry the bananas. The camel can carry at Read More →

## Fun & Game Puzzle

Puzzle: You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game. Would you want to play first or second? PS: The sum should be Read More →

## Chasing Dog Puzzle

Puzzle: There are four dogs each at the corner of a unit square. Each of the dogs starts chasing the dog in the clockwise direction. They all run at the same speed and continuously change their direction accordingly so that they are always heading straight towards the other dog. How long does it take for the Read More →

## Heavy and Light Balls Puzzle

Puzzle: You have 2 ball of each A,B,C colors and each color have 1 light and 1 heavy ball. All light balls are of same weight same goes for heavy. Find out weight type of each ball in minimum chances. You can use a two sided balance system (not the electronic one). This puzzle was Read More →

## Burning Rope Timer Puzzle

Puzzle: A man has two ropes of varying thickness (Those two ropes are not identical, they aren’t the same density nor the same length nor the same width). Each rope burns in 60 minutes. He actually wants to measure 45 mins. How can he measure 45 mins using only these two ropes. He can’t cut Read More →

## Inverted Cards Puzzle

Problem: One day, Santa and banta were playing cards, but suddenly power went off. Santa randomly inverted position of 15 cards out of 52 cards(and shuffled it) and asked banta to divide the card in two piles with equal number of cards facing up. It was very dark in the room and banta could not Read More →

## Red and Blue Balls in a Bag

Problem: You have 20 Blue balls and 10 Red balls in a bag. You put your hand in the bag and take off two at a time. If they’re of the same color, you add a Blue ball to the bag. If they’re of different colors, you add a Red ball to the bag. What Read More →

## 10 Coins Puzzle

Problem: You are blindfolded and 10 coins are place in front of you on table. You are allowed to touch the coins, but can’t tell which way up they are by feel. You are told that there are 5 coins head up, and 5 coins tails up but not which ones are which. How do Read More →

## Prisoners and Hats Puzzle

Problem: Four prisoners are arrested for a crime, but the jail is full and the jailer has nowhere to put them. He eventually comes up with the solution of giving them a puzzle so if they succeed they can go free but if they fail they are executed. The jailer puts three of the men Read More →