So you think you are clever, right? Then here is your chance to pit your brain against some of the world’s hardest logic puzzles ever created. 1. 10 identical bottles of pills We have 10 identical bottles of identical pills (each bottle contain hundred of pills). Out of 10 bottles 9 have 1 gram of … Read More →

## 2 Player and N Coin – Strategy Puzzle

Puzzle: There are n coins in a line. (Assume n is even). Two players take turns to take a coin from one of the ends of the line until there are no more coins left. The player with the larger amount of money wins. Would you rather go first or second? Does it matter? Assume … Read More →

## Minimum no Of Aircraft Puzzle

Puzzle: On Bagshot Island, there is an airport. The airport is the home base of an unlimited number of identical airplanes. Each airplane has a fuel capacity to allow it to fly exactly 1/2 way around the world, along a great circle. The planes have the ability to refuel in flight without loss of speed … Read More →

## The Pill Problem | Hard Brain Teaser

Puzzle: This is very hard brain teaser. A man has a medical condition that requires him to take two kinds of pills, call them P1 and P2. The man must take one P1 pill and one P2 pill each day, or he will die. If he takes more than 1 pill of the same kind … Read More →

## Cut Painted Cube Puzzle

Puzzle: A solid, four-inch cube of wood is coated with blue paint on all six sides. Then the cube is cut into smaller one-inch cubes. These new one-inch cubes will have either three blue sides, two blue sides, one blue side, or no blue sides. How many of each will there be? Puzzle Solution: Subtract … Read More →

## How Much Money He had Initially ?

Puzzle: One person has some money in his pocket, He visits four temple on the way. As soon as he enters a temple, his money gets double and he offers Rs. 100 in each temple thus his pocket gets empty after he returns from the fourth temple. Now the question is how much money he … Read More →

## When is Cheryl’s Birthday?

So when is Cheryl’s birthday? That’s a question confounding thousands of people around the world Monday as a test question from Singapore goes viral. Puzzle: Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible dates. May 15 May 16 … 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 →

## Prove that p^2 – 1 is Divisible by 24

Problem: Prove that p2 – 1 is divisible by 24 if p is a prime number greater than 3? Solution: The most elementary proof , without explicitly mentioning any number theory: out of the three consecutive numbers p–1, p, p+1, one of them must be divisible by 3; also, since the neighbors of p are … Read More →

## King Octopus and Servants Puzzle

Puzzle: King Octopus has servants with six, seven, or eight legs. The servants with seven legs always lie, but the servants with either six or eight legs always say the truth. One day, 4 servants met : The blue one says: “Altogether we have 28 legs”; the green one says: “Altogether we have 27 legs”; … Read More →

## Crossing the Bridge Puzzle

Puzzle: Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: … Read More →

## 100 Wrong Statements puzzle

Puzzle: There are 100 statements. 1st one says : at least one is wrong. 2nd one says : at least two are wrong. 3rd one says : at least three are wrong. 4th one says : at least four are wrong. and so on. 100th one says : at least 100 are wrong. How many statements … Read More →

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