Welcome to MindCipher, a social repository of the world's greatest brain teasers, logic puzzles and mental challenges.

### Ravi

#### Likes 89

 2 What Am I? 12 Choose the Next Letter 3 The fake coin 7 The bus stop 9 Three Idols 18 3 Men and a Hotel Room 3 What number is next? 10 Mutilated Chessboard Problem 8 Attic Lamp Switch 4 What am I? Show More
 5 Betsy and Patsy 4 Time To Fuse 2 The North Pole Bear Puzzle Reloaded 4 Balloon Business 56 All the King's Wine 2 Right or Left? 8 Prisoners and hats 5 Balloon in an Elevator 3 Are the lines parallel? 6 The Female Star 8 All Apples 8 Interview Question - Databases 3 The Cabin 4 Gone Camping 16 100 Light Bulbs 18 Cocktail Party 19 Going to the Track 28 12 Identical Balls 12 Carpeting a Donut 4 Boys and Girls 5 Clock Hands - Google Interview Question 6 Salary 9 Unfair Coin 4 Electrical Deaths 10 Fork in the road 1 Running Race 10 3 Coins 16 The double-square number problem 4 Don't Hang Yourself 11 Measuring Up 3 Products Algorithm 13 Bit Pair Swap 45 The Sinking Island 5 Balloon in an Elevator 10 3 Coins 9 Unfair Coin 13 Bit Pair Swap 45 The Sinking Island 3 Power of 2 (Microsoft Interview) 10 Two Trains 9 The Monty Hall Problem 15 Swap Variables in Place without XOR 37 No if() Only abs() 10 Sum of Two Prime Numbers 12 Gold or silver? 4 Electrical Deaths 10 Two Trains 9 The Monty Hall Problem 14 Coin Flip 8 Non-Adaptive 12 Identical Balls 5 Crazy Google Interview Question 6 Grey Squares Illusion 17 Multiples of 8 plus 1 21 Odd Pills 6 Find the Missing Number 7 The Neighbourhood 8 The Famous Hole in a Sphere 6 Partitioning a set 5 Matchsticks 12 Simple 24 5 Troll Toll 9 1978 4 Don't Mate in One 46 Charlie and the Chocolate Factory 8 Survivor 6 Binary 5 digits 2 How far can you go? 4 Cut the pizza into 11 equal slices with a wrist watch 5 Count The Bits 13 Black and White Hats 5 Lab Rat on the Run 6 Death by drawing? 3 How many? 3 Brain Teaser 56 4 There are only 4 circles and none of them touch 5 A Pharmacist's Nightmare 4 Sold! 5 Sand Timer Puzzle 5 Age of Three Kids

#### Ratings 63

 12 2.0 Choose the Next Letter 3 6.0 What number is next? 4 10.0 What am I? 10 10.0 Mutilated Chessboard Problem 7 2.0 Psycho Killer 8 10.0 Attic Lamp Switch 5 6.0 Betsy and Patsy 4 10.0 Time To Fuse 6 2.0 Find the Missing Number 18 2.0 3 Men and a Hotel Room Show More
 12 2 Choose the Next Letter 3 6 What number is next? 4 10 What am I? 10 10 Mutilated Chessboard Problem 7 2 Psycho Killer 8 10 Attic Lamp Switch 5 6 Betsy and Patsy 4 10 Time To Fuse 6 2 Find the Missing Number 18 2 3 Men and a Hotel Room