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World's Hardest Riddles With Answers

Worlds Hardest Riddles With Answers 1 : River Riddle
Difficulty ★★★★☆        Popularity ★★★★★

Four people need to cross a dark river at night.They have only one torch and the river is too risky to cross without the torch. if all people cross simultaneous then torch light wont be sufficient.Speed of each person of crossing the river is different.cross time for each person is 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the river ?

Worlds Hardest Riddles With Answers 2 : Popular Age Problem
Difficulty ★★★★☆        Popularity ★★★★★

Two old friends, Jack and Bill, meet after a long time.

Three kids
Jack: Hey, how are you man?
Bill: Not bad, got married and I have three kids now.
Jack: That"s awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool..But I still don"t know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh now I get it.

How old are Bill"s kids?

Worlds Hardest Riddles With Answers 3 : Who Is The Killer Puzzle
Difficulty ★★★★☆        Popularity ★★★★☆

Tarun Asthaniya is found dead in his office at his desk. The police have narrowed the suspects down to three people: Mrs. Harish Kumar, Taruns's wife Himanshi Asthaniya and his business partner Mr. Jason Negi . All three visited Tarun on the day of his murder, but all three provide the police with stories of explanation as to the reason for their visit. Police found Mr. tarun with his wrist watch still on his right arm, a torn up picture of his wife laying on the floor beside the trash can, and an ink pen in his right hand. On the desk, the police found a name plate, a telephone that was off the hook, and a personal calendar turned to the July 5th page with 7B91011 written on it. After examining this evidence, the police knew their suspect. Who was it ?

Worlds Hardest Riddles With Answers 4 : Brain Twister Puzzle
Difficulty ★★★★☆        Popularity ★★★★★


Solve it?

Worlds Hardest Riddles With Answers 5 : Hardest Balance Logic Puzzle
Difficulty ★★★★★        Popularity ★★★★★

You are given a set of scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to conclude either that the contents of the dishes weigh the same or that the dish that falls lower has heavier contents than the other.
The 12 marbles appear to be identical. In fact, 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more.

Note that the unusual marble may be heavier or lighter than the others. You are asked to both identify it and determine whether it is heavy or light.

Worlds Hardest Riddles With Answers 6 : Unlock The Distance Puzzle
Difficulty ★★★★★        Popularity ★★★★★

Distances from you to certain cities are written below.
BERLIN 200 miles
PARIS 300 miles
ROME 400 miles
AMSTERDAM 300 miles
CARDIFF ??? miles
How far should it be to Cardiff ?

Worlds Hardest Riddles With Answers 7 : Logic Interview Question
Difficulty ★★★★☆        Popularity ★★★★★

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its color and put it back into the box, without seeing the color of the other ball.

How many such operations are necessary to correctly label the boxes?

Worlds Hardest Riddles With Answers 8 : Hard Measuring Water Riddle
Difficulty ★★★★★        Popularity ★★★★★

You have two buckets of 11liter and 6liter.
How can you measure exactly 8liter ?

Worlds Hardest Riddles With Answers 9 : Logic Escape Problem
Difficulty ★★★★☆        Popularity ★★★★★

In the kingdom of skull, King Norse did not allow any citizen to visit the world outside. Also only a person with a proper paperwork was allowed to enter or he was sent back. A wooden bridge was what connected the kingdom to the world. The king had appointed a sharpshooter who would check every five minutes on the bridge to check. After checking, he would go back to his hut and return exactly after five minutes again. The bridge took 9 minutes to cross.

A merchant was able to escape the kingdom without harming the shooter.

How ?

Worlds Hardest Riddles With Answers 10 : Sherlock Holmes Cipher Puzzle
Difficulty ★★★★★        Popularity ★★★★☆

Sherlock, A detective who was mere days from cracking an international smuggling ring has suddenly gone missing. While inspecting his last-known location, you find a note:
710 57735 34 5508 51 7718
Currently there are 3 suspects: Bill, John, and Todd. Can you break the detective's code and find the criminal's name?


  1. Two scientists walked into a bar. One of them said,"I'll have H2O!
    the other scientist said,"I'll have H2O, too!

    The 2nd scientist died within a few minutes.

    1. because he had hydrogen peroxide :3

    2. Because there was a nuke inside the 2nd scientist's drink.

    3. Because there was a nuke inside the 2nd scientist's drink.

  2. They thought he meant H2O2 which is hydrogen peroxide.

  3. If you say my name I disappear. what am I?