Welcome to MindCipher, a social repository of the world's greatest brain teasers, logic puzzles and mental challenges.
6 6 Binary 5 digits
What is the base 10 equivalent of the highest 5 digit binary number?
Easy
2.0
10 20 Gold or silver?
What weighs more, a pound of silver or a pound of gold?
riddle chemistry Submitted by Jango
Easy
2.0
3 1 There are only 4 circles and none of them touch
Source: reddit.
optical illusion Submitted by Ravi
Easy
2.0
1 How many?2
How many people contribute to MindCipher?
Submitted by Gene
Easy
2.0
8 3 The Tallest Mountain
A man approaches you with a very enigmatic look on his face. He asks your for a bit of your time and if you could answer a quick question for him. He asks: “Before Mt. Everest was discovered, which w ...
riddle Submitted by Ravi
Easy
2.3
18 10 Cocktail Party
You are observing a cocktail party that has seven guests. You notice that each guest shakes hands with one another once they meet, but never again. How many handshakes occurred during the cocktail part ...
Easy
2.4
32 22 Charlie and the Chocolate Factory
Charlie once visited chocolate factory to buy some chocolates.Chocolate cost Rs. 3 each and he had only Rs. 45.He was disappointed. He wanted more. But when he reached the factory he was amazed. There ...
Easy
2.5
4 2 The Middle of Nowhere
What is in the middle of "nowhere"? The answer is indisputable, and not based on some philosophy.
riddle Submitted by Aakash
Easy
2.5
3 1 Are the lines parallel?
Are the horizontal lines in the picture parallel?
illusion Submitted by Valentin
Easy
2.5
3 2 Brain Teaser 56
Answer Yes or No to this brain teaser
Easy
2.5
4 2 Sold!
A dealer bought a painting for $70, sold it for $80, bought it back for $90, and sold it again for $100. How much profit did he make?
Submitted by Valentin
Easy
2.7
2 2 Tick Tock
With a seven-minute hourglass and an eleven-minute hourglass, what is the quickest way to time the boiling of an egg for fifteen minutes?
Submitted by Aakash
Easy
2.7
4 1 Don't Hang Yourself
A fool wants to tie a rope around the earth. So he buys a rope of 40,000 KM and ties it around the world. His neighbour, also a fool, wants to do the same only he wants the rope on sticks 1 meter abo ...
Easy
2.7
2 3 The Easy Sum of 1..100?
Quick,without using a calculator, what is the sum of all numbers between 1 and 100 inclusive? Or 1..10 for that matter..
Submitted by Valentin
Easy
2.8
7 7 Interview Question - Databases
This is a common interview question at companies like Google and Amazon: “Explain a database in three sentences to your eight-year-old nephew.” This question has an infinite number of solutions. Fee ...
Easy
2.8