These medium riddles are not too hard and not too easy, and are a great way to increase your riddle-solving prowess.
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Reasoning | ||
| Two Ropes Burning You have two lengths of rope. Each rope has the property that if you light it on fire at one end, ... | ||
| Cards in the Dark You are standing in a pitch-dark room. A friend walks up and hands you a normal deck of 52 cards. ... | ||
| A Fly In Between Trains Two trains are traveling toward each other on the same track, each at 60 miles per hour. When they ... | ||
| Wires, Batteries and Lightbulbs You are standing in a house in the middle of the countryside. There is a small hole in one of the ... | ||
| 3 Lightbulb Switches There are 3 switches outside of a room, all in the 'off' setting. One of them controls a lightbulb ... | ||
| Coins on a Table Your friend pulls out a perfectly circular table and a sack of quarters, and proposes a game. ... | ||
| Twelve Balls, One Different You have twelve balls, identical in every way except that one of them weighs slightly less or more ... | ||
| Engineers and Managers You have just purchased a small company called Company X. Company X has N employees, and everyone ... | ||
| Measuring Gallons of Water You have two jugs, one that holds exactly 3 gallons, and one that holds exactly 5 gallons. Using ... | ||
| A Liar and a Truth Teller You are walking down a path when you come to two doors. Opening one of the doors will lead you to a ... | ||
| The Missing Dollar Three people check into a hotel room. The bill is $30 so they each pay $10. After they go to the ... | ||
| Quick Bridge-Crossing Four people come to an old bridge in the middle of the night. The bridge is rickety and can only ... | ||
| Suitcase Locks A man needs to send important documents to his friend across the country. He buys a suitcase to put ... | ||
| Paying With Rings A man comes to a small hotel where he wishes to stay for 7 nights. He reaches into his pockets and ... | ||
| Same Number of Handshakes At a dinner party, many of the guests exchange greetings by shaking hands with each other while ... | ||
| The Missing Servant A king has 100 identical servants, each with a different rank between 1 and 100. At the end of each ... | ||
| Two Hourglasses You have two sand hourglasses, one that measures exactly 4 minutes and one that measures exactly 7 ... | ||
| A Liar OR a Truth Teller This is a harder version of the famous riddle, A Liar and a Truth Teller. You should try that ... | ||
| 25 Horses You have 25 horses. When they race, each horse runs at a different, constant pace. A horse will ... | ||
| Past the Bridge Guard A guard is stationed at the entrance to a bridge. He is tasked to shoot anyone who tries to cross ... | ||
| Ants on a Board There are 100 ants on a board that is 1 meter long, each facing either left or right and walking at ... | ||
| Monk on a Path A monk leaves at sunrise and walks on a path from the front door of his monastery to the top of a ... | ||
| Leap Year Birthday Bill and Stacie are delighted when their new baby, Patrick, is born on February 29th, 2008. They ... | ||
| Frog in a Well A frog is at the bottom of a well. It is a 30 foot climb to get out. Each morning, the frog jumps 3 ... | ||
| New York Hair You are visiting NYC when a man approaches you. "Not counting bald people, I bet a hundred bucks ... | ||
| Three Childrens' Ages A deliveryman comes to a house to drop off a package. He asks the woman who lives there how many ... | ||
| Colored Hats Against The Wall 100 men are in a room, each wearing either a white or black hat. Nobody knows the color of his own ... | ||
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Probability | ||
| Three Doors, 1 Prize You are on a gameshow and the host shows you three doors. Behind one door is a suitcase with $1 ... | ||
| Infinite Balls Paradox You have a basket of infinite size (meaning it can hold an infinite number of objects). You also ... | ||
| The Same Birthday What is the least number of people that need to be in a room such that there is greater than a 50% ... | ||
| Russian Roulette Choice Your enemy challenges you to play Russian Roulette with a 6-cylinder pistol (meaning it has room ... | ||
| Red and Blue Marbles Your friend shows you two jars, one with 100 red marbles in it, the other with 100 blue marbles in ... | ||
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Logic | ||
| Einstein's Riddle Einstein said that only 2% of the world could solve this problem. There are 5 houses in 5 different ... | ||
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Lateral Thinking | ||
| The Cellar Door A girl lives in a house with her parents. There is a cellar door in the house, and her parents warn ... | ||
| Fuzzy Math in the Hardware Store You overhear a man talking to a clerk in a hardware store. The clerk says "One will cost you 12 ... | ||
| Moochers What belongs to you, but other people use it more than you do? | ||
| Ladies Man Takes the Train A man who lives in Middletown has two girlfriends, one in Northtown and one in Southtown. Trains ... | ||
| Truck Crossing a Bridge A truck stops at a weigh station at the entrance to a bridge and is shown to weigh exactly 2000 ... | ||
| Dead in Water and Glass Romeo and Juliet are found dead in a small puddle of water, surrounded by broken glass. The ... | ||
| Dead Man in the Desert A man is found dead in the desert. He is wearing only his underwear. Half of a straw is found ... | ||
| A Bad Morning A man eats dinner, goes up to his bedroom, turns off the lights, and goes to sleep. In the morning, ... | ||
| Rainy Day Elevators A man lives on the 44th floor of his building. On rainy days, when he gets home from work, he takes ... | ||
| The Miller's Daughter A poor miller living with his daughter comes onto hard times and is not able to pay his rent. His ... | ||
| Five Men Like Pete Pete is a worker on a large ship with hundreds of other men. He is constantly making mistakes, ... | ||
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Language | ||
| Wetter as it Dries What gets wetter as it dries? | ||
| Many Things At Once It is greater than god, more evil than the devil, the poor have it, the rich need it, and if you ... | ||
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Math | ||
| Flipping Lockers There are 1 million closed school lockers in a row, labeled 1 through 1,000,000. You first go ... | ||
| 24 from Spare Parts Using only and all the numbers 3, 3, 7, 7, along with the arithmetic operations +,-,*, and /, can ... | ||
| 100 Meter Race Andy, Barry, and Carl race each other in a 100-meter dash. They each run at a constant speed ... | ||
| Average Salary Five coworkers want to know what the average of all their salaries is, but refuse to reveal ANY ... | ||
| Poison in the Wine The King of a small country invites 1000 senators to his annual party. As gifts, each senator ... | ||
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Spatial | ||
| The Circular Lake A swan sits at the center of a perfectly circular lake. At an edge of the lake stands a ravenous ... | ||
| Strange Miles You are somewhere on Earth. You walk due south 1 mile, then due east 1 mile, then due north 1 mile. ... | ||
| Tiling Without Corners You can easily "tile" an 8x8 chessboard with 32 2x1 tiles, meaning that you can place these 32 ... | ||
| Dividing the Cake Two twin brothers share the same birthday. Their father gets them a perfectly rectangular birthday ... | ||
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Programming | ||
| Anagram Checker Two words are anagrams if and only if they contain the exact same letters with the exact same ... | ||
| Robots on a Line Two robots are placed at different points on a straight line of infinite length. When they are ... | ||
