Hard Puzzles

The Latest and exclusive collection of Hard Puzzles to tease your brain. Hard Puzzles helps exercising the brain and develop it to think logical and solve real world problems differenlty. PuzzleFry brings you the best Hard Puzzles, you'll enjoy wide range of Hard Puzzles, Lets try few Hard Puzzles listed below -
  • Andrew Richardson, deputy head cryptographer at a top department of defence (DOD) facility, was working late one night. The last set of codes he received to decipher came from NASA ‘s space station. Apparently they had been receiving the same 5 set of codes over the past week on a high frequency band in visual digital format. They read……………

    wmoa eemn cfuu orrs
    wkia eesn ltpe ihlt
    hwth oeno pgem eewe
    wsta auob rnpl ispe
    aust lmmd laui hnse

    “Strange,” Andy thought. “Never received work from this site before.”
    Eager to finish and get home, he set to work on figuring out the troublesome codes. The first one took him some time ………….


    “What!” he laughed. He thought it was a joke or that he had deciphered incorrectly. However he continued using the same template, and by the time he’d finished he wasn’t laughing anymore. He quickly picked up his phone and dialed his director and then the head of the DOD. Somehow he knew he wasn’t going home tonight.

    What did Andy find that got him so worried?

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  • On Bagshot Island, there is an airport. The airport is the homebase of an unlimited number of identical airplanes. Each airplane has a fuel capacity to allow it to fly exactly 1/2 way around the world, along a great circle. The planes have the ability to refuel in flight without loss of speed or spillage of fuel. Though the fuel is unlimited, the island is the only source of fuel.
    What is the fewest number of aircraft necessary to get one plane all the way around the world assuming that all of the aircraft must return safely to the airport? How did you get to your answer?

    (a) Each airplane must depart and return to the same airport, and that is the only airport they can land and refuel on ground.
    (b) Each airplane must have enough fuel to return to airport.
    (c) The time and fuel consumption of refueling can be ignored. (so we can also assume that one airplane can refuel more than one airplanes in air at the same time.)
    (d) The amount of fuel airplanes carrying can be zero as long as the other airplane is refueling these airplanes. What is the fewest number of airplanes and number of tanks of fuel needed to accomplish this work? (we only need airplane to go around the world)

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  • To enlist the help of the other kingdoms, the king talked to the queen about inviting neighboring royalty to dinner. This put the queen into a royal snit. Theirs was not a very wealthy kingdom and the royal dinnerware was in a disgraceful condition. Apart from ordinary dishes for everyday use, all that the royal pantry contained were a few dinner plates of three different
    dinner patterns:
    1. five silver ones with birds
    2. six crystal with seashells
    3. seven gold with the royal crest
    They were all stored in disarray on a very dark top shelf of the royal pantry. Only those would be suitable for entertaining other royalty.
    If the queen didn’t want to climb up to the top shelf twice, how many dinner plates would she have to take down to be sure she had matching dinner plates for herself, her royal spouse, and for the neighbouring king and queen?

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  • Four Martians from different groups, the Uti,
    Grundi, Yomi and Rafi, gathered for an intraplanetary
    conference to discuss the problem of the visiting Earthlings.
    As was appropriate for diplomatic envoys, all
    were beautifully feathered in different colors, one red,
    one green, one blue and the fourth brown. Their names
    were Aken, Bal, Mun and Wora.
    1. Before the meeting, the Uti had a pleasant breakfast
    with Mun.
    2. After debating with the Martians in the blue and
    the brown feathers, Bal and the Yomi were so angry
    that they tore a wingful of feathers out of them
    before they were stopped.
    3. Wora and the Rafi, however, agreed with the diplomat
    with brown feathers, though they disagreed
    with the red-feathered Grundi.
    Who is the blue-feathered diplomat and to what
    group does he or she belong?

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  • There was trouble from the Grundi. One of them
    damaged the spaceship by hurling a rock at it. The
    astronauts couldn’t figure out what the Grundi had to
    gain by their hostile act. Was it just vandalism, done out
    of sheer spite? Or perhaps not everyone on Mars was
    happy to see the Earthlings return.
    The Martian police chief brought in five Grundi for
    questioning. Like all Grundi, they sometimes told the
    truth and sometimes lied. The suspects each made
    three statements, two of which were true and one of
    which was false. And the guilty one was revealed.
    1. Zum said:
    I am innocent.
    I have never used a rock to destroy anything.
    Tset did it.
    2. Uk said:
    I did not do the damage.
    The Earthman’s vehicle is on Grundi space.
    Yan is not my friend.
    3. Pala said:
    I am innocent.
    I never saw Yan before.
    Tset is guilty.
    4. Tset said:
    I did not throw the rock.
    Yan did it.
    Zum did not tell the truth when he said I did it.
    5. Yan said:
    I am innocent.
    Uk is guilty.
    Pala and I are old friends.
    Who was the culprit?

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  • There is a building of 100 floors
    -If an egg drops from the Nth floor or above it will break.
    -If it’s dropped from any floor below, it will not break.
    You’re given 2 eggs.
    Find N

    How many drops you need to make?
    What strategy should you adopt to minimize the number egg drops it takes to find the solution?

    2 eggs 100 floor puzzle

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    • 15 answers
    • 2 votes

  • Three people check into a hotel.

    They pay £30 to the manager and go to their room.

    The manager suddenly remembers that the room rate is £25 and gives £5 to the bellboy to return to the people.

    On the way to the room the bellboy reasons that £5 would be difficult to share among three people so he pockets £2 and gives £1 to each person.

    Now each person paid £10 and got back £1.

    So they paid £9 each, totalling £27. The bellboy has £2, totalling £29.

    Where is the missing £1?

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  • In a street there are five houses, painted five different colours. In each house lives a person of different nationality.
    These five home-owners each drink a different kind of beverage, smoke different brand of cigar and keep a different pet.

    1. The British man lives in a red house.
    2. The Swedish man keeps dogs as pets.
    3. The Danish man drinks tea.
    4. The Green house is next to, and on the left of the White house.
    5. The owner of the Green house drinks coffee.
    6. The person who smokes Pall Mall rears birds.
    7. The owner of the Yellow house smokes Dunhill.
    8. The man living in the center house drinks milk.
    9. The Norwegian lives in the first house.
    10. The man who smokes Blends lives next to the one who keeps cats.
    11. The man who keeps horses lives next to the man who smokes Dunhill.
    12. The man who smokes Blue Master drinks beer.
    13. The German smokes Prince.
    14. The Norwegian lives next to the blue house.
    15. The Blends smoker lives next to the one who drinks water.

    Who owns the fish?

    This riddle was by Albert Einstein. He claims that only 2% of the world’s population can solve it.

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  • People are waiting in line to board a 100-seat airplane. Steve is the first person in the line. He gets on the plane but suddenly can’t remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it’s available, otherwise they will choose an open seat at random to sit in.

    The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

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    • 10 answers
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