Logical Puzzles 1 : 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?
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Logical Puzzles 2 : 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 ??
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Logical Puzzles 3 : 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?
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Logical Puzzles 4 : 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.
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Logical Puzzles 5 : Cricket Puzzle
Difficulty ★★★☆☆ Popularity ★★★★★
Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?
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Logical Puzzles 6 : 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 ?
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Logical Puzzles 7 : 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?
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Logical Puzzles 8 : 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?
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Logical Puzzles 9 : 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?
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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
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Logical Puzzles 11 : 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)
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Logical Puzzles 12 : 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?
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Logical Puzzles 13 : February Maths Puzzle
Difficulty ★★★★☆ Popularity ★★★★★
Using eight eights and addition only, can you make 1000?
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Logical Puzzles 14 : 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?
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Logical Puzzles 15 : 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?
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Logical Puzzles 16 : 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?
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Logical Puzzles 17 : Secret Code puzzle
Difficulty ★★★☆☆ Popularity ★★★★☆
A man wanted to get into his work building, but he had forgotten his code. However, he did remember five clues. These are what those clues were:
The fifth number plus the third number equals fourteen.
The fourth number is one more than the second number.
The first number is one less than twice the second number.
The second number plus the third number equals ten.
The sum of all five numbers is 30.
What were the five numbers and in what order?
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Logical Puzzles 18 : 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?
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Logical Puzzles 19 : 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?
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Logical Puzzles 20 : Water Pails Puzzle
Difficulty ★★★☆☆ Popularity ★★★★☆
If you had an infinite supply of water and a 5 quart and 3 quart pails, how would you measure exactly 4 quarts? and What is the least number of steps you need?
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Last Updated:2012-04-21