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### 5 Hardest Logic Riddles

5 Hardest Logic Riddles

Logic Riddles 1 : 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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Logic Riddles 2 : 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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Logic Riddles 3 : 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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Logic Riddles 4 : 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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Logic Riddles 5 : 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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Last Updated:2011-10-14

1. becauuse the man does not have enough height to swtich the 10th floor in elevator

2. ditto because he can use his umbrella or ask someone else

3. because he is a miget and when he goes to work he can reach the level 1 button but when he comes back he only can reach the 7th floor button and walks the rest of the way but when it is raining he has an umbrella th reach the 10th floor or when some one else is with him they could reach the button for him

4. sorry guys its surpose to be 'an umbrella to reach the 10th floor button'

5. switch on 1st switch button. after some time switch on 2nd and switch off 1st and enter in room ,if bulb is on then 2nd switch is connected to bulb,if bulb is off,touch the bulb if it is hot then 1st switch is connected to bulb and if bulb is cool 3rd switch is connected to bulb.

6. same as yogesh

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8. 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?

Surely the last line of this puzzle should read... "Why did he want NINE?

9. He was smart as otherwise the passengers would use those parachutes and get away too

10. Whoa, some of these were really tricky! I came across some tough logic riddles that were real head scratchers recently, check them out and see if you can answer them: Logic Riddles