Colloquial name for a puzzle where there is no number 16. Types of puzzles. Position: teacher of additional education
There is a rich house and a poor one. They are burning. Which house will the police put out?
The police do not extinguish fires, firefighters extinguish fires
How can a person stay awake for 8 days?
Sleep at night
You enter a dark kitchen. It contains a candle, a kerosene lamp and a gas stove. What will you light up first?
A girl is sitting, and you cannot sit in her place, even if she gets up and leaves. Where is she sitting?
She sits in your lap
You are standing in front of three switches. Behind an opaque wall, three lights are off. You need to manipulate the switches, go into the room and determine which light bulb each switch belongs to.
First you need to turn on two switches. After some time, turn off one of them. Enter the room. One light bulb will be hot from the switched on switch, the second - warm from the off, the third - cold, from the untouched switch
It is known that among the nine coins there is one counterfeit, which has a lower weight than the rest of the coins. How can a counterfeit coin be determined using a scale in two weighings?
1st weighing: 3 and 3 coins. The counterfeit coin in the pile that weighs less. If they are equal, then the fake is in the third pile. 2nd weighing: Any 2 coins from the pile with the lowest weight are compared. If they are equal, then the fake is the remaining coin
Two people come up to the river. Off the shore is a boat that can only hold one. Both people crossed over to opposite bank... How?
They were on opposite shores
Two fathers, two sons found three oranges and shared them. Each got a whole orange. How can this be?
The dog was tied to a ten-meter rope and walked 300 meters. How did she do it?
The rope was not tied to anything
How can a thrown egg fly three meters and not break?
You need to throw an egg four meters, then the first three meters it will fly whole
The man was driving a large truck. The lights on the car were not lit. There was no moon either. The woman began to cross the road in front of the car. How did the driver manage to see it?
It was a bright sunny day
If five cats catch five mice in five minutes, how long does it take for one cat to catch one mouse?
Five minutes
Can you light a match underwater?
It is possible if water is poured into some container, for example, into a glass, and the match is kept below the glass
The boat sways on the water. A ladder is thrown from it along the side. Before the tide, the water covered only the bottom step. How long will it take for the water to cover the third step from the bottom, if during the tide the water rises 20 cm per hour, and the distance between the steps is 30 cm?
Never, as the boat rises with the water
How to divide five apples between five girls so that each gets an apple and one of the apples remains in the basket?
Give one girl an apple with a basket
One and a half pike perch costs one and a half rubles. How much do 13 pike perch cost?
Merchants and potters. In one city, all people were merchants or potters. Merchants have always told the truth, and potters have always told the truth. When all the people gathered in the square, each of those gathered said to the others: "You are all merchants!" How many potters were there in this city?
The potter was alone, because:
- If there were no potters, then the merchants would have to tell the truth that all the other merchants, and this contradicts the condition of the problem.
- If there were more than one potters, then each potter would have to lie that the rest of the merchants.
There are two coins on the table, in total they give 3 rubles. One of them is not 1 ruble. What are these coins?
1 and 2 rubles
The satellite makes one revolution around the Earth in 1 hour 40 minutes, and the other - in 100 minutes. How can it be?
100 minutes is 1 hour 40 minutes
As you know, all Russian female names end either with the letter "a" or with the letter "I": Anna, Maria, Irina, Natalia, Olga, etc. However, there is one single female name that ends in a different letter. Name it.
What has no length, depth, width, height, but can be measured?
Time, temperature
If it rains at 12 o'clock in the morning, can we expect that in 72 hours there will be sunny weather?
No, since it will be night in 72 hours
Seven brothers have a sister. How many sisters are there?
One yacht goes from Nice to San Remo, the other from San Remo to Nice. They left the harbors at the same time. The first hour the yacht moved at the same speed (60 km / h), but then the first yacht increased the speed to 80 km / h. Which yacht will be closer to Nice at the time of their meeting?
At the time of their meeting, they will be at the same distance from Nice.
A woman was walking to Moscow, and three peasants were there to meet her. Each has a sack, each sack has a cat. How many creatures were heading to Moscow?
Only the woman went to Moscow, the rest went the other way
There were 10 birds sitting on the tree. A hunter came and shot one bird. How many birds are left on the tree?
None - the rest of the birds flew away
The train runs from east to west, and the wind blows from north to south. In which direction is the smoke flying from the chimney?
You are in a marathon and overtook the runner-up. What position are you in now?
Second. If you answered that you are now the first, then this is wrong: you overtook the second runner and took his place, so you are now in second position.
You are running a marathon and have passed the last runner. What position are you in now?
If you answered that it was the penultimate one, you were wrong again :). Think about how you can overtake the last runner? If you run after him, then he is not the last. The correct answer is that it is impossible, you cannot overtake the last runner.
There were three cucumbers and four apples on the table. The child took one apple from the table. How many fruits are left on the table?
3 fruits and cucumbers are vegetables
The goods first rose in price by 10%, and then fell in price by 10%. What is its cost now relative to the original?
99%: after the price increase, 10% was added to 100% - it turned out 110%; 10% of 110% = 11%; then subtract 11% from 110% and get 99%
How many times does 4 appear in integers from 1 to 50?
15 times: 4, 14, 24, 34, 40, 41, 42, 43, 44 - twice, 45, 46.47, 48, 49
You have covered two thirds of the way by car. At the beginning of the journey, the car's gas tank was full, but now it is one-quarter full. Will there be enough gasoline to the end of the journey (at the same consumption)?
No, since 1/4< 1/3
Mary's father has 5 daughters: Chacha, Cheche, Chichi, Chocho. What is the name of the fifth daughter?
A deaf-mute man went to a stationery store to buy a pencil sharpener. He stuck a finger in his left ear and made a rotational movement with his other hand near his right ear. The seller immediately understood what they were asking for. Then a blind man entered the same store. How did he explain to the salesman that he wanted to buy scissors?
He just said he was blind, but not dumb
A rooster flew to the border of Russia and China. He sat down exactly on the border, absolutely in the middle. Lay an egg. It fell exactly across: the border divides it in the middle. Which country does the egg belong to?
Roosters don't lay eggs!
One morning, a soldier who had previously been on the night guard approached the centurion and said that that night he had dreamed about how the barbarians would attack the fortress from the north tonight. The centurion did not really believe in this dream, but nevertheless took measures. That evening, the barbarians did attack the fortress, but thanks to the measures taken, their attack was repulsed. After the battle, the centurion thanked the soldier for the warning, and then ordered him to be taken into custody. Why?
For sleeping at the post
There are ten fingers on the hands. How many fingers are there on ten hands?
The plane with English tourists flew from Holland to Spain. In France, he crashed. Where should the surviving (injured) tourists be buried?
The survivors do not need to be buried! :)
You drove a 42-passenger bus from Boston to Washington. At each of the six stops, 3 people got out of it, and at every second - four. What was the driver's name when the driver arrived in Washington 10 hours later?
How are you, because at the beginning it was said that you drove the bus
What can you find in minutes, seconds and days, but not years, decades and centuries?
How many times can 3 be subtracted from 25?
Once, because after the first subtraction, the digit "25" will change to "22"
All Mrs. Taylor's bungalows are decorated in pink, with pink lamps, pink walls, pink carpets and pink ceilings. What color are the stairs in this bungalow?
There are no stairs in the bungalow
In the old castle, where the prison was located, there were 4 round towers in which prisoners were imprisoned. One of the prisoners decided to escape. And then one fine day he hid in a corner, and when the guard entered, he stunned him with a blow to the head, and he ran away, changing into other clothes. Could this be?
No, since the towers were round and there were no corners
The 12-storey building has an elevator. Only 2 people live on the first floor, from floor to floor the number of residents doubles. What's the most pressing button in the elevator in this house?
Regardless of the distribution of residents by floors - button "1"
A pair of horses ran 20 kilometers. Question: how many kilometers did each horse run separately?
20 kilometers
What can at the same time: stand and walk, hang and stand, walk and lie?
Is it possible to predict the score of a football match before it starts, and if so, how?
The score of any match before it starts is always 0: 0
What can a person have 7 times in diameter in a few seconds?
Pupil. In the transition from bright light to dark, the diameter can change from 1.1 to 8 mm; everything else either hardly increases, or increases in diameter by no more than 2-3 times
A seller in the market sells a hat that costs 10 rubles. A buyer comes up and wants to buy it, but he has only 25 rubles. The seller sends the boy with these 25 rubles. to the neighbor to exchange. The boy comes running and gives 10 + 10 +5 rubles. The seller gives the hat and change 15 rubles, and 10 rubles. keeps himself. After a while, a neighbor comes and says that 25 rubles. fake, demands to give her money. The seller returns the money to her. How much money was the seller deceived?
The seller was deceived for a fake 25 rubles.
How many animals did Moses take on his ark?
The animals were taken into the ark, not by Moses, but by Noah
2 people entered the entrance at the same time. One has an apartment on the 3rd floor, the other has an apartment on the 9th. How many times will the first person get there faster than the second? Note: they pressed buttons at the same time in 2 elevators moving at the same speed.
The usual answer is 3 times. Correct answer: 4 times. Elevators usually run from the 1st floor. The first will pass 3-1 = 2 floors, and the second 9-1 = 8 floors, i.e. 4 times more
This puzzle is often offered to children. But sometimes adults can rack their brains for a long time to figure out how to solve such a problem, so you can arrange a competition: invite everyone to try to solve the problem. Anyone who guesses, regardless of age, deserves a prize. Here's the challenge:
6589 = 4; 5893 = 3; 1236 = 1; 1234 = 0; 0000 = 4; 5794 = 1; 1111 = 0; 4444 = 0; 7268 = 3; 1679 = 2; 3697 = 2
2793 = 1; 4895 = 3
The main thing is to look at the problem in a childish way, then you will understand that the answer is 3 (three circles in the recording of numbers)
Two dzhigits competed: whose horse will come to the finish line last. However, the matter did not go, both stood still. Then they turned to the sage for advice, and after that both galloped at full speed.
The sage advised the horsemen to exchange horses
One student tells another: “Yesterday, our college basketball team won the basketball match 76:40. At the same time, not a single basketball player scored a single goal in this match ”.
Women's teams played
A man walks into a store, buys a sausage and asks to cut it, but not across, but along. The saleswoman asks: "Are you a firefighter?" - "Yes". How did she guess?
The man was in shape
The lady did not have a driver's license with her. She did not stop at the railway crossing, although the barrier was lowered, then, not paying attention to the "brick", she moved along the one-way street against the traffic and stopped only after passing three blocks. All this happened in front of the traffic police officer, who for some reason did not consider it necessary to intervene.
The lady was walking
There were three tailor shops on one Odessa street. The first tailor advertised himself like this: "The best workshop in Odessa!" Second - "The best workshop in the world!" The third "outdid" both of them.
"The best workshop on this street!"
The two brothers were drinking at the bar. Suddenly one of them began to argue with the bartender, and then pulled out a knife and, ignoring his brother's attempts to stop him, hit the bartender. At the trial, he was found guilty of murder. At the end of the trial, the judge said: "You have been found guilty of murder, but I have no choice but to let you go." Why did the judge have to do this?
The culprit was one of the Siamese twins. The judge could not send the guilty person to jail without imprisoning an innocent person there.
We rode in the same compartment Baba Yaga, Serpent Gorynych, a stupid warrant officer and a clever warrant officer. There was a bottle of beer on the table. The train entered the tunnel, it became dark. When the train exited the tunnel, the bottle was empty. Who drank the beer?
The stupid ensign drank the beer, since the rest of the creatures are unreal and do not occur in life!)
The classic puzzle "14-15" is a square box with 15 square tiles inside. The tiles are numbered from 1 to 15. The box can hold 16 tiles (4 horizontally and 4 vertically), but instead of the tile number 16, there is an empty space. Due to this free space, tiles can move freely. The last two tiles with numbers 14 and 15 are rearranged. It is required, without removing any tiles from the box, to move them so that the numbers are arranged in order, and the empty square is in the lower right corner. The general view of this puzzle is shown in the figure.
The authorship of this puzzle is often attributed to Sam Lloyd. In 1891, Loyd awarded a $ 1,000 prize for solving a puzzle correctly. Tens of hundreds of people swore that they had solved the problem, but not one was able to remember the moves in order to write them down and receive an award for it. Appointing a prize, Loyd did not risk anything, because the problem he proposed was unsolvable. Of more than 20 billion possible square arrangements, exactly half of the combinations can be obtained by moving the squares from the initial arrangement. The rest of the arrangement of the squares, including the one that needs to be found using the terminology of the permutation theory, have a different "parity", and the permutations with different parity do not pass into each other when the squares move inside the box.
From 1891 until his death, Samuel Loyd believed that he had invented the puzzle. However, in 2006, in their new book The 15 Puzzle, Jerry Slocum and Dic Sonneveld prove that Sam Loyd did not invent this puzzle, but made contemporaries and generations to believe it.
Painstakingly sifting through thousands of newspapers of the time in the United States and Europe, the authors uncovered the true origin of the puzzle. The real inventor of the puzzle was Noah Palmer Chapman, postmaster from Canastota, who back in 1874 showed his friends a puzzle consisting of sixteen numbered squares that had to be folded in rows of four so that the sum of the numbers in each row was 34. Then the son November Chapman, Frank Chapman brought the refined puzzles to Syracuse, New York, and then to Hartford, Connecticut, where students at the American School for the Hearing began to produce the puzzle. By 1879, it was already on sale not only in Hartford, but also in Boston. Then the woodworker Matthias Rice learned about the "tag". In December 1879, he started a new puzzle business called the Gem Puzzle. In early 1880, a certain Charles Pevey, a dentist from Worcester, attracted the attention of the public, offered a monetary reward for solving the problem of solving the puzzle, which added to the popularity of the new game. In the spring of the same year, the game reached Europe.
On February 21, 1880, Noah Chapman tried to file a patent for his invention (the patent was called "Block Solitaire Puzzle"), but the patent application was rejected because it differed little from the patent "Tricky Blocks "(English" Puzzle-Blocks ").
Since the classic version of the puzzle - swapping the places of tiles with numbers 14 and 15 has no solution, then over time the purpose of the puzzle has changed slightly - it is necessary to arrange all tiles with numbers from 1 to 15 in their places from any position in which all or part tiles are not in place. You can play a similar version of "Fifteen"on-line .
Since the invention of "Fifteen", this puzzle has had all sorts of options. Instead of the standard set of tiles numbered from 1 to 15 and placed in a 4x4 box, there are puzzles with a different number of tiles and sizes:
Sometimes letters are used instead of numbers, then the goal of the puzzle is to collect a certain phrase, a set of words:
Often, instead of numbers, pictures are applied to the tiles, the goal of the puzzle is to collect the picture completely:
There are three-dimensional puzzles, but all the tiles are still in the same plane:
In addition to just collecting a picture, sometimes you need to complete a certain task:
Pit Stop Puzzle
It is necessary to move the tiles so as to "change" the car's wheels
Spider's Web Puzzle
It is necessary to move the tiles so that the spider is in the center of the web
Puzzle "Hole 19"
It is necessary to move the tiles so as to "hit" the golf ball
Oost West puzzel
It is necessary to move the tiles so that all directions of the cardinal points fall into place
Puzzle "Proton"
It is necessary to move the tiles so as to connect all the protons with one bond
Olympic Sports Puzzle
Through holes are made on the tiles in the form of Olympic sports. The same sports are painted on the inside of the box. All sports must be matched
Calendar Puzzle (Calendar)
On the left, you can set the year and month, but the numbers relative to the days of the week have to be moved independently to get a calendar
Super Solitaire Puzzle
It is necessary to move the tiles so as to get certain card combinations
First round. Blitz.
Question number 1.
What did Napoleon give to an actress who, during a conversation, unceremoniously asked Bonaparte for a portrait as a keepsake?
Coin.
The connoisseurs answered.
Question number 2.
Why was the cross engraved on the reverse of the medieval penny?
To make the coin easier to chop into pieces.
The connoisseurs answered.
Question number 3.
The reverse of the Italian 1 euro coin depicts a drawing by Leonardo da Vinci, the Spanish one depicts King Carlos I, and the German one depicts an eagle. What is depicted on the reverse of a Greek coin?
Owl.
The connoisseurs answered. The score is 1-0.
Round two.
The figure shows a heraldic shield with a monogram, the monogram consists of three Latin letters. Whose monogram is this and what does each letter mean?
This is the monogram of Peter I. The letters mean "Peter I the Emperor".
The connoisseurs did not answer. The score is 1-1.
Round three.
While traveling around Britain, Guy de Maupassant often saw the same picture: three or four cows grazing by the road and one ram with them. As a local resident explained to the writer, why do animals graze in such a company?
The ram is the share of the wolf.
The connoisseurs did not answer. The score is 1-2.
Round four.
What is the purpose of this cutlery?
Chicken leg clip.
The connoisseurs did not answer. The score is 1-3.
Fifth round. Black box.
Tsumayoji is in the black box. "Tsuma" in Japanese means "nail"; "e" - "willow"; "ji" - "branch". What's in the black box?
Toothpick.
The connoisseurs did not answer. The score is 1-4.
Sixth round.
In March 1881, a painting with two names was presented at the exhibition of the Itinerant Society in St. Petersburg. One of them is "Fool". What is the second, better known name.
"Alyonushka". Orphan girls were popularly called the word "fool".
The connoisseurs did not answer. The score is 1-5.
Seventh round.
Recently, a group of American sociologists came up with an equation that can be used to calculate the rate of increase in the number of bestsellers purchased. It turned out that a similar equation has been known for a long time, however, it is used in another area of human activity. What is calculated by the same equation?
The spread of epidemics.
The connoisseurs answered. The score is 2-5.
Eighth round.
This sport was born thanks to amateurs of another sport - amateurs who, in anticipation of good weather, smoked cigars and enjoyed good champagne. What sport was born at the end of the 19th century and how did it come about (you have a bottle of champagne, glasses and a box of cigars at your disposal)?
Table tennis. A bottle cork replaced a ball, and cigar boxes replaced rackets.
The connoisseurs answered. The score is 3-5.
Ninth round.
The object that you see in the picture is called gyrk, in Russian - dublo. In the life of a peasant family, one such subject was enough. What was it used for?
They put a small child there who could not walk yet.
The connoisseurs answered. The score is 4-5.
Round ten.
Once Loyd Osborn was painting in the courtyard behind an easel. What was the name of his stepfather, who, watching this, out of idleness, drew a map and put unusual names on it?
Eleventh round. 13th sector.
P P
B B
C C
What do these letters mean and which one is missing?
Days of the week. There is not enough "H".
The connoisseurs answered. The score is 6-5.
Connoisseurs were able to recoup from a 1-5 score. When asked about the bestsellers, they took a minute on credit, and they were able to answer the question about Stevenson ahead of schedule. From the faces of the connoisseurs after the game, one could understand that they themselves did not understand how it happened. Highly interesting game turned out.
Since its inception, the Rubik's Cube has been the most popular toy in the world. Inspired by it, many come up with various original puzzles, and the most interesting of them can go into mass production. Per last years the market for mechanical puzzles has grown to a huge size, so we decided to create a small guide for those who are interested in this segment, but do not know where to start.
What kinds of puzzles are there?
First of all, it's worth understanding simple terminology in order to understand how some products differ from others:
Shapemod is a cube modification based on changing the shape of external parts. At the same time, the assembly principle almost does not change, but due to the unusual design, it becomes much more difficult to do this.
Bandage puzzles are distinguished by the fact that, when moving, they are able to block some edges, creating significant difficulties for the one who solves them.
Of great interest to collectors are puzzles that can change shape when disassembled. This ability allows them to take on a whimsical appearance, confusing the owner.
The strangest puzzles
Perhaps the most popular 3x3 cube shapemode, which has long become a classic. This disproportionate cube always attracts people's attention and impresses with its simple and futuristic appearance. And the relatively low price makes it affordable for a wide variety of sectors of society.
Another well-known shapemod that is interesting for its deceptive appearance. From a distance, it is easy to confuse it with a pyramid, but in fact, inside this amazing puzzle there is an ordinary three-ruble note. With the exception of a few non-standard situations, the Mastermorphix is assembled in the same way as its cubic counterpart.
The last shapemod in our top is deservedly the Axis Cube. Despite its intricate and intimidating appearance, its design is also based on the standard 3x3 cube. Main feature the puzzle became that, when disassembled, it completely loses its shape, making its solution a truly exciting experience.
This product stands out from the rest for its versatility. The cube comes with a set of different caps with which you can combine elements to create different banding puzzles with a unique assembly principle.
These puzzles surprise many with their intricate design, but in reality they are not as difficult to assemble as it seems. The number of different versions of the toy testifies to its success: in the company's assortment you will find almost all regular polyhedrons, including the cube, octahedron, dodecahedron and even icosahedron. Each edge has a certain number of points around which parts can rotate.
A real record holder who will not leave anyone indifferent. Instead of coming up with something radically new, the MF8 company decided to take the megaminx we are used to and increase it to incredible sizes.
This cuboid is very similar to 3x3, but consists of as many as nine layers, making it one of the largest on the market. Distinctive feature has become a well-thought-out design that allows you to assemble it without much effort. Also worth mentioning are the many other interesting and high quality cuboids produced by VitEden.
Shapemode of a unique puzzle from VitEden called Mixup 3x3. Such an octahedron can rotate like an ordinary treshka, but if you mistrust the middle face, you immediately discover its amazing ability to swap edges and centers. In this state, the puzzle quickly loses its shape, so it can occupy its owner for a long time.
The second place in the list is deservedly taken by Geranium Plus. This flat puzzle is one of the hardest in the world and consists of many different pieces moving along inner circles. Even after the first movements, it can easily confuse you, so it is perfect to test your abilities.
This puzzle was based on the classic 3x3 cube, but additional rotation axes were added on each side, making the principle of its solution radically new and unusual. This toy attracts many lovers difficult tasks its spectacular appearance and will become a real challenge for those who decided to assemble it on their own.
Of course, most of the interesting puzzles did not fit into this list, so you can always visit our catalog and find what you especially like.
There are many different puzzles and their types. Of course, it is impossible to tell about all of them, so it is worth touching on only the most popular ones.
Mechanical puzzles
Mechanical puzzles- these are puzzles in the form of any devices. For example, , Rubik's Snake and others. They are popular due to their availability for the population that does not have access to the Internet, as well as for children and their parents.
Crossword
Crossword(English crossword - intersection of words) or crossword - the most widespread word game in the world. There are many periodicals specializing in crosswords they are also often printed in non-specialized print media.
Rebus
Rebus(Latin rebus - with the help of things; instrumental plural of res - thing) - a riddle in which the words to be solved are given in the form of pictures in combination with letters and some other signs.
Charade
Charade(fr. charade - riddle) - a kind of riddle.
Charade is a breakdown of a word into syllables in such a way that each syllable has the meaning of an independent word. After that, as in a riddle, a description of each of these syllable words is given (for example, fact + hurray = texture). The concept of a syllable in charades does not coincide with the concept of a syllable in phonetics. Syllable in charade only in a particular case can it be a phonetic syllable, but it can also consist of several phonetic syllables, or it can contain no vowels at all.
Syllables in charades can be any part of speech: verbs, nouns, adjectives, unlike other puzzles. Often charades presented in verses. In this case, the conceived word breaks up into "charade syllables."
(colloquial Rubik's Cube; originally known as the Magic Cube) is a mechanical puzzle invented in 1974 (and patented in 1975) by the Hungarian sculptor and architecture teacher Erne Rubik.
The puzzle is a plastic cube made up of 26 smaller cubes that can rotate around axes invisible from the outside. Each of the nine squares on each side of the cube is colored in one of six colors, usually in pairs opposite each other: white-yellow, blue-green, red-orange. Rotating the sides of the cube allows you to reorder the colored squares in many different ways.
The player's task is to turn the sides of the cube to return it to a state where each face consists of squares of the same color ("collect »).
Is a popular puzzle game invented in 1878 by Noah Chapman. It is a set of identical square dice with applied numbers, enclosed in a square box. The length of the side of the box is four times the length of the side of the knuckles for a set of 15 elements (and three times longer for a set of 8 elements), respectively, one square field remains empty in the box.
The goal of the game is to move the knuckles around the box to arrange them by numbers, preferably by making as few movements as possible.
Sudoku
Sudoku Is a number puzzle that has become very popular lately. Translated from Japanese "su" means "digit", "dook" means "standing apart". Sometimes sudoku called the "magic square", which is generally not true, since sudoku is a 9th order Latin square. Sudoku actively publish newspapers and magazines different countries the world, compilations sudoku published in large circulations. Solution sudoku Is a popular leisure activity.
The playing field is a 9x9 square, divided into smaller squares with a side of 3 cells. Thus, the entire playing field consists of 81 cells. They already contain some numbers (from 1 to 9) at the beginning of the game, since an empty playing field does not make sense, because then the task will not be set. Depending on how many cells are already filled, the specific sudoku can be classified as easy or difficult.
Example sudoku written in JavaScript, you can see on the Sudoku page.
Logical paradoxes
Paradox- a situation (statement, statement, judgment or conclusion) that may exist in reality, but has no logical explanation. Distinguish paradox and aporia. Aporia, Unlike paradox, is a fictional, logically correct, situation (statement, statement, judgment or conclusion) that cannot exist in reality.
Also paradox- a statement that is at odds with the generally accepted opinion and seems illogical (often only with a superficial understanding). Paradox, in contrast to the aphorism, is striking in surprise. For example, Wilde's "Divorces Are Committed in Heaven."
Paradox- this is always a half-truth and it is, as Oscar Wilde said, "the best we can achieve, because there are no absolute truths." Paradox its stylized form resembles an aphorism. V paradox the usual truth is crumbling before our eyes and even ridiculed. For example, "I have heard so much slander against you that I have no doubts: you are a wonderful person!" (O. Wilde), "Mutual misunderstanding is the most suitable basis for marriage" (O. Wilde).