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Logic Puzzle Problems

Logic Puzzle Problems 1 : Challenging Puzzle
Difficulty ★★★★☆        Popularity ★★★★★

Outside a room there are three light switches. One of switch is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb ??

Light Bulb Puzzle


Logic Puzzle Problems 2 : Unsolvable Riddle
Difficulty ★★★☆☆        Popularity ★★★★☆

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly


Logic Puzzle Problems 3 : Aeroplane Hijack puzzle
Difficulty ★★★★★        Popularity ★★★★☆

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?


Logic Puzzle Problems 4 : Alexander Puzzle
Difficulty ★★★★☆        Popularity ★★★★★

Alexander is stranded on an island covered in forest.

One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alexander survive the fire? (There are no buckets or any other means to put out the fire)


Logic Puzzle Problems 5 : Gold Bar Fewest Cut Puzzle
Difficulty ★★★☆☆        Popularity ★★★★☆

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?
golden bar puzzle


Logic Puzzle Problems 6 : Challenging Logic Puzzle
Difficulty ★★★☆☆        Popularity ★★★★☆

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?


Logic Puzzle Problems 7 : Cricket Puzzle
Difficulty ★★★☆☆        Popularity ★★★★★

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?


Logic Puzzle Problems 8 : Two Door Riddle
Difficulty ★★☆☆☆        Popularity ★★★★★

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You dontknow the identity of the two.You can ask only one question to go out from there. What should you ask?
two wooden door puzzle

Logic Puzzle Problems 9 : Cross Bridge Puzzle
Difficulty ★★★★☆        Popularity ★★★★☆

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?


Logic Puzzle Problems 10 : February Maths Puzzle
Difficulty ★★★★☆        Popularity ★★★★★

Using eight eights and addition only, can you make 1000?


Logic Puzzle Problems 11 : Puzzle Boat
Difficulty ★★★★☆        Popularity ★★★★☆

At the local model boat club, four friends were talking about their boats.

There were a total of eight boats, two in each colour, red, green, blue and yellow. Each friend owned two boats. No friend had two boats of the same colour.

Alan didn't have a yellow boat. Brian didn't have a red boat, but did have a green one. One of the friends had a yellow boat and a blue boat and another friend had a green boat and a blue boat. Charles had a yellow boat. Darren had a blue boat, but didn't have a green one.

Can you work out which friend had which coloured boats?

boat cartoon puzzle


Logic Puzzle Problems 12 : Famous Elevator Puzzle
Difficulty ★★★★☆        Popularity ★★★★☆

A man who lives on the tenth floor takes the elevator down to the first floor every morning and goes to work. In the evening, when he comes back; on a rainy day, or if there are other people in the elevator, he goes to his floor directly. Otherwise, he goes to the seventh floor and walks up three flights of stairs to his apartment.
Can you explain why?


Logic Puzzle Problems 13 : Water Jugs Problem
Difficulty ★★☆☆☆        Popularity ★★★★☆

Six jugs are in a row.
The first three are filled with coke, and the last three are empty.
By moving only one glass, can you arrange them so that the full and the empty glasses alternate?


Logic Puzzle Problems 14 : Famous Probability puzzle SHOOT
Difficulty ★★★★☆        Popularity ★★★★☆

Mr. Black, Mr. Gray, and Mr. White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr. Black, who hits his shot 1/3 of the time, gets to shoot first. Mr. Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr. White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr. Black, where should you shoot first for the highest chance of survival?


Logic Puzzle Problems 15 : Cipher Age Puzzle
Difficulty ★★★★★        Popularity ★★★★☆

If Susan is 10, Arabella is 20, and Jim and Neal are both 5, but Richard is 10, how much is Jennifer by the same system?


Logic Puzzle Problems 16 : 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 tourch. if all people cross simultanoesly 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 ?
river puzzle


Logic Puzzle Problems 17 : 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?


Logic Puzzle Problems 18 : Challenging Mind puzzles
Difficulty ★★★★★        Popularity ★★★★☆

You are the ruler of a medieval empire and you are about to have a celebration tomorrow. The celebration is the most important party you have ever hosted. You've got 1000 bottles of wine you were planning to open for the celebration, but you find out that one of them is poisoned.

The poison exhibits no symptoms until death. Death occurs within ten to twenty hours after consuming even the minutest amount of poison.

You have over a thousand slaves at your disposal and just under 24 hours to determine which single bottle is poisoned.

You have a handful of prisoners about to be executed, and it would mar your celebration to have anyone else killed.

What is the smallest number of prisoners you must have to drink from the bottles to be absolutely sure to find the poisoned bottle within 24 hours?


Logic Puzzle Problems 19 : NewsPaper Puzzle
Difficulty ★★★☆☆        Popularity ★★★★☆

A newspaper is supposed to have 60 pages
but pages 24 and 41 are missing.
Which other pages won't be there?


Logic Puzzle Problems 20 : Unlock The Distance Puzzle
Difficulty ★★★★★        Popularity ★★★★★

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


  1. What letter comes next in this sequence.


    1. A great question from my side....
      While going up a mountain,(not resting) in the middle of ur journey u saw in front of you a couple with 3 daughters and 3 sons.
      Each daughter had 2 son and 2 daughter who each had 7 son and 3 daughter. How many people are going up the mountain??????

      Only One thats bcoz u can never see people who are goin up a mountain in front of u when u r in the middle of ur journey. And u didnt rest

  2. 2 who cares how many children and grand children the couple has..