A collection of classic logic puzzles ranging from simple deduction to multi-step reasoning. Can you solve them all?
If all Bloops are Razzies and all Razzies are Lazzies, are all Bloops definitely Lazzies?
Alice, Ben, and Carla each have a different pet: cat, dog, or turtle. Clues: Alice does not own the dog. Ben owns the turtle. Carla does not own the cat.
Four friends — Amy, Ben, Carl, Dana — each drink a different beverage: tea, coffee, juice, or water. Clues: Amy does not drink tea. Ben drinks coffee. Carl does not drink juice. Dana drinks water.
Three boxes are labeled: 'Apples', 'Oranges', and 'Apples and Oranges'. Every label is wrong. You may take one fruit from one box without looking inside.
On an island, every inhabitant is either a truth-teller (always tells the truth) or a liar (always lies). You meet two people: A and B. A says: 'At least one of us is a liar.'
Four cards lie on a table showing: A, D, 4, and 7. Each card has a letter on one side and a number on the other. Rule: 'If a card has a vowel on one side, it has an even number on the other.'
Two guards stand before two doors. One door leads to freedom, the other to certain death. One guard always tells the truth, the other always lies, but you do not know which is which. You may ask one guard one question.
A statement reads: 'Exactly two of the following statements are true: A) B is false. B) C is true. C) A is false.'
If you were running a race, and you passed the person in 2nd place.
If I fly to the moon in a ship and on the way I meet five other ships each with five crew members who each have five pets.
I am a three-digit number. My second digit is 4 times bigger than the third digit. My first digit is 3 less than my second digit.
Two fathers and two sons are sitting on a bench, yet there are only three people sitting.
A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters.
Olivia is four times old as her daughter. In 20 years’ time, she will be twice as old as her daughter.
Mary has four daughters, and each of her daughters has a brother.
At a four-legged table, there is one grandma, two mothers, two daughters, and a granddaughter.
If two brothers are born at the same time on the same day and in the same year but are not twins, how is that possible?
A father and son were in a carriage accident. The father died, and the son was rushed to the doctor. But the doctor said, 'I cannot operate on him; he is my son!' How is this possible?
Five friends are together in a room. Ashley is knitting. Charlotte is cooking. Mia is playing chess. Alice is reading a book.
Two girls are born to the same mother on the exact same day, at the same time, but they aren't twins. How is that possible?
The 22nd and 24th presidents of the U.S. had the same parents, but were not brothers. How is this possible?
When Mary was 8, her brother was half her age. Now that Mary is 14.
You’re driving a bus. At the first stop, you pick up four children with blue eyes. At the next stop, you pick up six children with brown eyes. On the final stop, you pick up nine children with green eyes.
I am a number. I'm not an odd number. I'm higher than 90, but not higher than 100. If you subtract me from 100 you get zero.
Olivia has six siblings. Each one is two years apart. The youngest, Kelsey, is 7 years old, and Olivia is the oldest.
If it takes 13 people 5 days to build a barn, how many days will it take 21 people to build the same barn?
A cargo boat holds 49 shipping containers. There are 36 more small containers than large containers.
A fish lives at the bottom of a 30-foot lake. Each morning, it swims up three feet. At night, it floats down two feet. How many days will it take the fish to reach the surface?
Two moms and two daughters are in a car, but there are only three people in the car.
A man puts 20 apples into a basket. He eats all but five of them.
John's mother had three children. The first was named Melissa. The second was named David.
What number do you get if you multiply all the numbers on a telephone keypad?
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