How the Rubik's Cube works. The most unusual Rubik's cubes in the world

This is one of the most popular toys, which almost everyone played in childhood, and which is now played by modern children. On sale you can find many variations of this puzzle: from children's lightweight options, and ending with complex geometric shapes, for the assembly of which, you will have to spend more than one hour.

Today we will look at comparable different kinds Rubik's Cube, And we will help you make a choice.

First, a bit of history: the Rubik's Cube (the classic original size was 3x3x3) was invented in 1974 by the Hungarian sculptor and architecture teacher Erno Rubik. Moreover, he came to the idea of ​​​​creating a world puzzle quite by accident: Erno could not explain to his students the mathematical theory of groups. Then he took 27 small wooden cubes and painted them in 6 different colors. Unexpectedly for himself, Rubik realized that putting them into one cube so that each face was painted in its own color was quite difficult. The teacher himself struggled with this task for a month!

Thus, Erno Rubik was created fascinating puzzle and study guide in one subject. The last and most difficult step was to come up with a mechanism. And on January 30, 1974, E. Rubik receives a Hungarian patent for his invention "Magic Cube".

In early 1980, it was decided to rename the invention from "Magic Cube" to "Rubick's Cube". It was at this time that the real boom and dawn of the miracle cube began! The puzzle went on sale around the world: people bought them instantly, it was Hungary could not keep up with the production of cubes, and a sea of ​​​​imitations appeared on the market. Hungary could produce no more than a few million pieces a year, so factories began to open in Hong Kong, Costa Rica, Taiwan and Brazil.

Interesting facts:

• Initially, the Rubik's Cube was considered as a teaching aid for students.
• Number of all reachable different states Rubik's Cube 3x3x3 is equal to 43,252,003,274,489,856,000.
• In the 80s, more than 60 Rubik's Cube books were published.
• Artists have created works of art from Rubik's Cubes.
• There are official competitions for the speed assembly of the Cube.
• The current record for the 3x3x3 cube is 4.904 sec.
• In addition to the classic cube, there are many other forms of the puzzle: pyramids, balls, dodecahedrons, and so on.
• On this moment The largest "non-virtual" Rubik's Cube is a 13x13x13 cube.

Well, now let's look at Rubik's Cubes, which you can purchase in our store.

1. Rubik's Cube 2x2 for kids

This light version for the smallest, with sides of two cubes instead of three, painted in two colors. A great way to instill in your child a love of puzzles with early age- buy Rubik's Cube 2x2. As soon as the young genius manages to assemble it, you can move on to more complex options.

2. Rubik's Cube 2x2

This Rubik's Cube is also a lightweight version, but harder than a child. If in children's Cube Rubik's faces are painted in only two colors, then this uses the classic version: 6 faces - 6 colors. Perfect fit for beginners, as well as for those young geniuses that have collected children's version, and want to move on to a more difficult puzzle!

3. Rubik's Cube 3x3 Classic Version

This classical, the original version of the famous puzzle. It was in this form that the cube was created by the Hungarian sculptor and architect Erno Rubik. Perfect suitable for all ages. You can collect the cube as you are, fully involved in the process of solving the puzzle, as well as special formulas to hone your manual dexterity and assembly speed. This model is made from quality plastic and comes with original stand.

4. Buy Rubik's Cube 3x3 Speed

This cube for a true professional. Created for super- quick assembly . As you already know, there are Rubik's Cube competitions, and this particular model is popular with the participants. Each element is made of the highest quality, which positively affects the assembly speed. Comes with a set of two screwdrivers, which are needed in order to tighten the screws of the cube, adjusting the rotation speed for you. Also included in the kit is silicone lubricant to minimize friction movable parts of the cube. If you are a master of assembling the famous puzzle, then this one is definitely for you!

5. Rubik's Cube 4x4

And here is more complicated model! If you have mastered the 3x3 version of the cube, then you simply must go to new level. After all, this puzzle has absolutely other assembly algorithms, other loopholes and tricks. But this cube is also suitable for you if you immediately want to start with a complex one and properly strain your hands and brains.

6. Rubik's Cube 5x5

The most difficult puzzle from the entire series! Buy Rubik's Cube 5x5 is a must if you are real professional in a build of previous light versions and want to advance to the next level. The number of combinations and options increases, the algorithms become more complex, and at the same time, the time you spend sitting at this model increases. Made from quality plastic, comes with original stand.

7. Rubik's Tower

An unusual variation of the puzzle. Represents parallelepiped, with sides two and four cubes. Due to its shape, the tower is much harder than a classic cube, so it will take more than one hour to break your head over it. For the first time, the Rubik's Tower appeared in Japan, it was so fond of the Japanese that it immediately became popular all over the world.

8. Rubik's snake

Easy and interesting puzzle for kids. The snake consists of 24 triangles that rotate, allowing you to create different shapes. Develops hand motor skills, imagination and logic, such a snake will be a real find for an inquisitive child.

9. Rubik's Cube 3x3 VOID

Another version of the famous puzzle. Represents cube hollow inside. It has a completely different movement mechanism. VOID is universal: suitable for both newcomers, and professionals folding the Rubik's Cube. Made of high quality, pleasant to the touch plastic.

10. Cube of Venus

This model has the same operating principle and mechanism as the classic Cube. The difference is only in the form - the details of the Cube of Venus have different bizarre shapes. The distance between parts is kept to a minimum. Great puzzle and for newbies, and for those who want to try something else besides the classic version.

11. Shift gears

Unusual and original puzzle. Consists not just of faces, but from the faces in the form of gears rotating in three planes at once. Incredibly entertaining toy that will help develop logical and spatial thinking. Solve, twist, find assembly paths by creating and writing your own algorithms!

12. Gear Cube

A real intellectual puzzle! It has the same principle of operation as the previous cube: rotating gears. But this cube is going significantly lighter than a regular Rubik's Cube so perfect for beginners and kids. Develops spatial thinking and motor skills.

13. Magic Rubik

The most non-standard puzzle from our range. Represents a plate of 8 square panels, size 4x2. Correctly assembled puzzle forms a pattern of three connected and three disconnected rings. The principle of operation is very simple: all the panels are interconnected with a special fishing line, which allows you to move the panels as you please. Fold, unfold, bend, fold. The most important thing in using this toy: if you feel the tension of the line, it is better to try to fold the game in the other direction, where the process is softer.

14. Rubik's Pyramid (Meffert's Pyramid)

Beautiful brain trainer in the form of a pyramid. The puzzle is pyramid with 4 sides, each with a different color. Suitable for beginners, since it is much easier to assemble the Meffert Pyramid than the classic Rubik's Cube.

Puzzle - great way enjoy and enjoy your time. At home, on the road, at work - it remains only to choose and buy the Rubik's Cube that is right for you!

Rubik's Cube - an ordinary puzzle, which is a visual aid for algebraic theory, suddenly attracted the attention of the whole world. For more than one decade, it has made people who are far from the mathematical sphere plunge into an exciting process. - The best way improvement of logical thinking and memory training.

Secrets of the Rubik's Cube

The six sides of the product have certain shades and a strict arrangement patented by the manufacturer. Existing fakes can be exposed precisely by the unusual color scheme and the distribution of colors that differs from the original. Teaching materials always “stick” to the standard design, so it is absolutely not surprising that beginners, using analogues, get confused in the explanations.

All sides consist of a specific set of squares. Their number determines the type of Cube - 3x3, 4x4, 5x5, etc.

The debut model, which was assembled by Erno Rubik, consisted of 27 wooden cubes, identically painted in 6 shades. For a month, the author tried to group the elements so that they all matched in hue. The inventor spent much more time developing a mechanism that holds the parts together.

The classic modern cube consists of the following parts:

Centers - fixed parts fixed on rotational axes. They are directed towards the owner of an exclusively colored face.
Ribs are moving parts. The owner has the ability to see two painted sides. The color set here is standard.
Corners - eight movable elements located at the tops of the product. Each has three colored edges.
The fastening mechanism is a dense crosspiece of tightly coupled axles. There is an alternative that looks like a sphere. It is used in high-speed and multi-element versions. The most complex is the design with an even number of parts - this is a system of connected click devices, which are sometimes combined with a cross. There are magnetic mechanisms designed for professional products.

Fans of the square rebus constantly fight against the clock. To achieve their goal, they not only train manual dexterity, but also study, memorize and bring dozens and even hundreds of different combinations to automatism. This sport even has its own name - speedcubing!
Tournaments are held with enviable constancy, and the table of records is constantly updated. Modern users discover new heights to conquer and confidently strive for them. In competitions, confrontations are often held blindly, with the help of one hand and even with legs.

Names and structures of rotations

To describe the manipulation of the famous puzzle, the creation of permission schemes and just comfort, a special language of rotations was composed. It looks like familiar letters that are designed for a special face and rotation method. The sides are capitalized!

The Russian-language instruction looks like this:

F - facade
T - rear
L - left
P - right
B - top
H - bottom

The world version, of course, resorts to using the English alphabet:

R-right
L-left
D-down
U-up
B - back
F-front

The central elements, like the faces, are called by one letter. The edges have a two-letter combination. For example, FR or UL Angles are described by three - FRU Groups of particles that are middle layers are also named:

M - middle (between L and R)
E - equatorial (D and U)
S - standing (B and F)

Rotational movements combine the letters corresponding to the sides and additional signs:

The apostrophe ' indicates that the turns are counter-clockwise.
Number 2 means repetition.

How does the Rubik's Cube work?

To decide in which direction to make a turn, it is necessary to mentally imagine the clock face and “follow” the imaginary arrow! There is also a very important value - W. It declares the rotation of two layers. Interceptions - turning the whole cube. They take place on 3 levels:

X and x' - movement along the "X" axis, coinciding with the turn of the right side
y and y' - along the "Y" axis, coinciding with the top
z and z' - along the "Z" axis, coinciding with the front edge
z2, x2 and y2 are double interceptions

In addition to the generally accepted rules, the manuals are full of slang, the names of all kinds of techniques, figures or patterns that are famous among speedcubers. Schematic descriptions are also involved, where arrows are in demand. With the addition of experience in assembling a cube, all existing explanations become as clear as possible and are perceived at the level of intuition.

The cap is the color details collected on the edge.
The belt is the colored elements adjacent to the "Hat".
The cross is a figurine of five particles of an identical shade.
A flip is a turn of an edge at one point relative to the center.

Everyone can learn how to assemble an extremely intricate cube, feel the logical sequence of movements and work out the simplest algorithms. Before making any decision, you need to carefully examine the product and identify the same type of particles that will form the Hat. Often the process begins with a white edge, although true masters allow themselves to change the trajectory of actions.

Who set the record for the fastest Rubik's Cube?

Felix Zemdeggs is a famous Australian who broke the record twice in 2018. Initially, the result was 4.6 seconds, and in May of this season, he reduced the figure to 4.22 seconds. Also, the young athlete was noted in the period from 2015 to 2017, leaving several current records on the pages of the Guinness Book.

In 1974, the 30-year-old Hungarian Erno Rubik, a teacher at the Academy of Applied Arts and Crafts, created what would later be called the Rubik's Cube and glorify him for centuries. Much time has gone into technical solution, which provides an optimal mechanism for turning the face of the cube, which resulted in a characteristic, signature creak. Both numbers and drawings were tried on the edges, but Rubik chose flowers.

Standard cube 3*3*3 with a face width of 5.4 cm, 2*2*2 for children, 4*4*4 (Rubik's revenge) and 5*5*5 (professor's cube) are also produced. Designs larger than 3 * 3 * 3 are unreliable and often fall apart. Recently, a Greek developed and patented reliable Rubik's cube mechanisms with sizes from 5 * 5 * 5 and more. His dice can be collected for speed, as well as 3*3*3. There are successful instances of 6*6*6 and 7*7*7.

English inventor Andrew Fentem (Andrew Fentem) using modern technology created a Rubik's Cube without moving faces. Touch-sensitive surfaces and special sensors that react to the rotation of the device. Instead of colorful squares, 216 LED screens are used, which can be controlled by changing the position of the cube in space or simply touching it.

Another interesting modification of the classic puzzle is magnetic cube Rubik's collected from dice. You can assemble such a model yourself using 108 magnets, 27 dice, a couple of clips, a drill and a screwdriver.

For only $ 20 in distant Japan, you can buy a Rubik's Cube, code-named "geography teacher's nightmare". The fact is that this puzzle is made in the form of a square globe, and in order to assemble it you need not only to distinguish colors, but also to understand geography.

Another original Rubik's Cube designed by designer Zhiliang Chen. Each side of this cube is made of different materials: metal, wood, fabric, rubber, plastic and stone. A very unusual toy. And yet such a cube can be collected by touch.

But the Rubik's cube for the lazy. Even I could assemble this one, because all its sides are the same color.

Rubik's cube in art.

Funny guys from Space Invaiders founded their own art movement called . The new teaching is based on the concept that everything in the world consists of Rubik's cubes, so all works created in the Rubicubism style are naturally created from.

Design in the style of "Rubik's Cube".

The popularity of the Rubik's Cube has no limits, it is not surprising that it has become a source of inspiration for artists and designers. Look not Illuminate Cube - desktop speakers with light music, made in the form of a huge Rubik's cube. They not only reproduce the sound, but also highlight it, because the Illuminate Cube has 27 color shades and countless combinations of them.

Guess what it is? It’s not easy to guess, because it’s stylized as a Rubik’s cube. To activate such a player, simply rotate one of the faces.

The funny USB hub not only reminds Rubik's Cube fans of their favorite puzzle, but brings tangible benefits due to the convenience of operation, because each USB socket rotates 180 degrees.

Some facts about the Rubik's Cube.

In 1975, in socialist Hungary, Rubik patented his puzzle. Later, the creator of the Rubik's Cube became the first official socialist millionaire.

1980 the beginning of the real distribution of the cube around the world. The American company "Ideal Toy Corporation" gives the cube its correct name and orders 1 million cubes. In a few years, about 100 million cubes and even more fakes were produced. About 60 books have been published. According to various estimates, every 8-10 inhabitants of the Earth turned the Rubik's cube in their hands.

Throughout its history, the cube has repeatedly received various awards, for example, it received the national prize of Hungary as the best invention, was recognized as the best toy in the USA, Great Britain, France and Germany. In 1981, the cube was on display at the New York Museum of Modern Art. in England, a ceremony was held to present the cube to Prince Charles and Lady Diana, in honor of whom a special edition was issued.

In 1982, the Rubik's Cube entered the prestigious Oxford Dictionary.

In 2007, about 9 million rubles were sold in the world.

1982 was marked by the first world speed cube assembly championship. It was held in the homeland of the inventor in Budapest. The record was 22.85 s. Recently, Leyan Lo, 20, took 11.13 seconds to complete the puzzle.

1. A bit of history
2. The smallest Rubik's cube
3. Custom Rubik's Cubes

The history of this entertaining puzzle begins in 1974, but to this day its popularity has not diminished at all. On the contrary, people invent more and more new ways to complicate the toy or give it originality. Today we will talk about the largest Rubik's cube in the world.

A bit of history

In 1974, Erne Rubik, a thirty-year-old architecture teacher from Budapest, did not even imagine that his destiny was to soon become a millionaire. He was seriously interested in geometric problems and 3D modeling, and he considered the project of the future cube for several years.

The first product consisted of 27 small wooden cubes with colored edges. With his help, Erne tried to explain to his students the basics of the mathematical theory of groups. The aim of the invention was that the individual cubes should rotate independently without violating the overall design.

The total number of faces in the first version was 156, but later the creator reduced this number to 54. Then the product began to look exactly the way it looks today. Instead of one cube, a special linking mechanism was placed in the middle, which turned the invention into a toy.

The idea was liked by all Rubik's acquaintances, and soon he decided to patent it. The first batch of cubes on an industrial scale was released in 1977, several copies also ended up in the Soviet Union. But the West was not conquered immediately.

Popularity came from the moment the toy was promoted by a computer businessman from Germany, Tibor Lakzi. Today, the Rubik's Cube is a must-have item on the shelves of any toy and puzzle store. Whole championships are held to collect it.

The largest Rubik's cube in the world

The product consists of huge amount small cubes - the length of each side is 33 elements. It was made using 3D printing technology by Grégoire Pfennig, a fairly well-known puzzle creator in the world. Previously, he has already implemented more than a hundred projects of varying complexity.

And the giant Rubik's Cube among them is far from the most complex and time-consuming. However, to collect it, a person may need several thousand hours. The internal structure of the product consists of seventeen layers, and each one moves in relation to the others.

The total number of elements of the toy, if you can call it that, is 6,153, all of which are made on an automated digitally controlled machine (or SNS). The machines were provided by 3D Print Fabriek, which also sponsored the production.

It took Gregoire about two hundred hours to complete the cube, but it should be noted that he did this not alone, but with several assistants. It took the same amount of time to stick labels to each part. Only then could the cube be considered ready. The area of ​​one of its sides is comparable to the area of ​​a chessboard.

The cube is available to order from Olivier's Sticker Shop and is priced at $18,000. In addition, the products are out of stock, after ordering, you will have to wait 3-4 months until it is made.

Oscar van Devent Cube

A Dutch engineer invented a kind of toy that includes more than one and a half thousand elements (17x17x17). Oscar has previously been known for outstanding puzzles, but in this case he clearly wanted to hit the whole world.

Before that, he had already created unusual Rubik's cubes from 3x3x3 to 11x11x11, but they did not gain much fame. The creation of an instance took 1.5 thousand pounds and 60 hours of real time.

The length of the side of the cube is 140 mm, the total number of elements is 1539. The parts were 3D printed and hand-painted in the desired colors. The painting process alone took over ten hours.

Oscar van Devent solves the usual Rubik's cube in 2 minutes, but he has not yet discovered the algorithm for collecting his own invention.

The most expensive Rubik's cube in the world

To mark the 40th anniversary of the invention of the popular puzzle in 2014, the jewelry company Diamond Cutters International released its own interpretation of it. The toy was created from yellow gold of sample No. 750, and on each of its faces there are dozens of precious stones in an invisible frame.

Different stones are used as colors of individual sides: amethysts, diamonds, rubies, sapphires and emeralds. This piece of jewelry required 8,500 hours to complete. The total cost can be approximately estimated at $ 2,500,000.

The product was first presented at an American exhibition called Beyond Rubik's Cube, held in New Jersey. But even after that, he did not remain unclaimed cargo, and to this day he travels to various world exhibitions.

The smallest Rubik's cube

It is worth mentioning here the merits of our compatriot, Russian E. Grigoriev, a programmer from Cheboksary. He is a big fan of this toy and knows how to assemble it in just a minute.

But one day, a 40-year-old man got the idea to complicate and diversify his task, and at the same time get on the pages of the Guinness Book of Records. For a month, Evgeny made a toy using a laser. It turned out a product with a side length of only one centimeter.

According to the creator, it has really become more difficult to assemble the puzzle - now it takes as much as 3 minutes.

Custom Rubik's Cubes

In addition to the usual square products that differ only in side lengths, there are also very interesting varieties puzzles. Let's consider a few of them:

1. Megaminx. An invention that works on the principle of the Rubik's Cube, but has the shape of a dodecahedron. It exists both in a 12-color version (when each face is painted in a separate color), and in a 6-color version (where opposite faces are painted in the same color). The toy is also called the “magic dodecahedron”, and it was first released back in 1973, that is, even earlier than the main character of this article.


2. Meffert pyramid. And this product was also invented before the usual cube - in 1972 by the German inventor Uwe Meffert. The pyramid has 4 multi-colored sides, and it is much easier to assemble it than Rubik's toys - there are only a million possible combinations. More than 90 million copies have already been sold since the first release.


3. Scube. The game got its name in 1982, and earlier it was called the “pyramid cube”. The main difference from a regular cube is that four axes rotate parallel to the diagonals, and not six axes parallel to the faces. Although the shape of the product is cubic, the assembly scheme is much more reminiscent of the pyramid mentioned above.


4. Square-1. When assembled, this puzzle is quite similar to the Rubik's Cube. But in the disassembled it is something completely shapeless and incomprehensible, and the assembly scheme is different. Square-1 can change shape by twisting, which adds to the complexity. The toy was invented in the Czech Republic in 1990.


5. Voidcube. A very interesting option. In appearance, this is a cube familiar to us, but if you look closely, there is no center inside that connects all the elements to each other. But the puzzle does not fall apart, despite the lack of a cross. Accordingly, the assembly algorithm here is completely unique.


6. Mirror cube. In it, all the details have the same color, but different sizes. The initial shape is cubic, but when rotated, it becomes disordered - here and there there are protrusions or depressions. But this is only at first glance very difficult, in fact there is a short algorithm that allows you to bring the game to the starting position.


7. Siamese cubes. Enough difficult option, consists of two interconnected products 3x3x3. It is worth mixing it, and only two internal and two external parts become available for rotation.


8. Master pyramorphix. A puzzle based on gears combined in a pyramidal shape. The number of moving parts - 26, colors - 4. When disassembled, the original shape is not preserved.

Puzzles are a great way to develop your mental abilities and hand motor skills, to train logical thinking. Therefore, we strongly recommend that you learn how to play with one or even several of the listed unusual toys.

See also: 

One of the most popular puzzles is still the well-known Rubik's Cube. For those who consider it banal and outdated, experts do not get tired of offering various modifications to the familiar design. Today, its mirror counterpart is gaining popularity. A real hit among lovers of minimalism. But how to solve a mirrored Rubik's cube? This article will help you figure it out.

Origin

It is always difficult to imagine something second. The next modification of the Rubik's Cube, however, has become very popular.

Japanese Hidetoshi Takei presented it to the public at the IPP26 event in 2006, held in the American city of Boston. The novelty immediately attracted attention and interested puzzle fans. Now many are wondering how to solve a Rubik's mirror cube.

Appearance

It is called mirror only by analogy with its appearance. The material for the product is usually plastic. All its faces are painted in silver or gold with a mirror finish. Nothing superfluous, flashy, what is designed to attract the consumer. Only the real pleasure of building a cube.

The real beauty of the puzzle is hidden inside. As soon as the collector turns one of the faces, the product will take on an unusual look. It becomes like a sculpture of a modern author.

But how to assemble a mirror Rubik's cube if it does not differ in color, and its shape has changed beyond recognition before our eyes? It is necessary to make sure that large, medium and small boxes remain on each face.

This puzzle will appeal to both the child and the adult. To develop your mind in such an elegant way is not only interesting, but also pleasant.

Design and purpose

Mirror Rubik's cube is made on the basis of its predecessor with parameters 3x3x3. It consists of 26 elements, which can be divided into three types based on their size: small, medium and large.

Starting to rotate the faces, we can assume that it is impossible to solve the puzzle, but to understand how to solve a mirror Rubik's cube, it is enough to apply the same algorithms as when working with a traditional model.

First stage

You should start small - collect a cross on the underside. To do this, find the edge with the largest parallelepiped. The face on which it is located is rotated to the right so that it moves down. Then it is moved counterclockwise, and the desired rectangle should be in the central part. Next, rotate the upper face twice - the edge is now located on top.

Sometimes there is a slightly different scheme. How to solve a mirror Rubik's cube, if one of necessary elements is located opposite face? Then the front part is moved in the direction of the clock hand, the upper part is against, then the right edge is in the opposite direction.

collect corners

To arrange the corners, you need to turn the right and bottom parts - counterclockwise, and repeat these two steps again.

middle

The puzzle must be held so that the not yet completed face is on top. On it you should find a large rectangle and move it to the corner. The combination is as follows: turn the top and then the right side clockwise, the top - in the opposite direction, the right - similarly, the top and front - against, the top - clockwise, the front side - similarly.

Next stage

How to solve a mirrored Rubik's cube 3x3? It is also worth twisting the puzzle: The front face - rotate clockwise, repeat this movement with the top and right sides, then the right side - in the opposite direction, the top - similarly, the front - against.

Picking a rib

The cube itself must be rotated so that two of the four edges available are equal in size. The best option if it is squares. They should form an angle. Two unfinished edges are assembled by the following combination: the right side - in the direction of clockwise movement, the top - according to the same principle, again the right - in the opposite direction, the top - clockwise, the right side - similarly, the top - twice clockwise, the right - in opposite side, top - clockwise.

Gather Angle

You should find a corner element that is equal to the size of the part on the middle edge, but rotated incorrectly. This corner must be kept near you. The remaining corner parts are assembled as follows: the top side is clockwise, the right side is in the same way, the top is counterclockwise, the left side is against, the top is clockwise, the right side is against, the top is similar, the left side is in the opposite direction.

Completion

Now let's see how to assemble last layer mirrored Rubik's cube. To do this, you need to work with the corner elements. Among them, you should find the one that is not yet right. It should be facing you and to the left. Then it is worth doing the following algorithm: the right part is counterclockwise, the lower one is similar, the right one is clockwise, the lower one is in the same way.

The combination should be done so many times that the corner is in the right place. The top side is then rotated counterclockwise. The next corner appears and the algorithm repeats.

Such a puzzle can become a child's favorite entertainment, distract him from newfangled gadgets. It can also be solved big company: collectively or competing against the clock. It is worth testing yourself with a Rubik's Cube!