## Solves a Rubik’s Cube blindfolded… with his feet!

Solving a Rubik’s cube is too easy.

Solving a Rubik’s cube blindfolded gets interesting, but I need something more.

What if I solve it blindfolded with my feet?

Timothy Goh

Something like that must have been what this cuber thought. He says that it took him 100 attempts to solve the cube. Keep in mind that when solving the cube blindly, any wrong move will cause us not to solve the cube. And with the feet… it is not easy to be so precise.

## Children’s book on the Rubik’s Cube

A few weeks ago I received a book entitled ‘Andres and His Rubik’s Cube Madness’. It is a children’s book about the story of a boy (Andres) who discovers the Rubik’s Cube thanks to a neighbor. The book tells a story of overcoming and perseverance in which many of us will be represented. The book is designed for children from 4 to 8 years old, as it does not have much text but many drawings (very nice). However, I believe that older children can also enjoy it as they feel more identified with the main character in his early days of the Rubik’s Cube. I leave you some photos of the book so that you can check the quality of its drawings:

If you’re interested, you can buy the book on Amazon.com.

Mario, from DIYgiveaways, has written to tell me that he has created some headphones to listen music shaped as a Rubik’s Cube. I love them!

It’s a shame not to be very skilled to create my own. But if you are, you can build your own Rubik’s Cube headphones followings the indications of this video:

If you like this kind of DIY (Do It Yourself) construction, you can subscribe to his YouTube channel.

## Solve the Rubik’s Cube in 20 movements

One of the most famous questions related to Rubik’s Cube is: “How many movements are required to solve the Rubik’s Cube?” That is, what is the minimum number of moves I need to solve any Rubik’s cube position.

It may seem that this is an easy problem to solve using today’s computers. However, a Rubik’s Cube can be in so many different positions, that this problem can not be solved testing positions one by one.

## God number is 20

Because of the headaches that caused this issue, the number of moves needed to solve any Rubik’s Cube was called “god number”. In 1981 it was discovered that this number was bounded between 18 and 52. The margin of error was decreased in 1995, reducing the uncertainty between 20 and 29 movements.

Finally, in 2010, 29 years after the first estimation, it was found that the God number was exactly equal to 20. That is, any position of Rubik’s cube can be solved in 20 moves or less. To obtain this number were necessary Group Theory skills (remove symmetries and related positions), and the use of Google supercomputers.

## Can I solve the Rubik’s cube in 20 steps?

Because this information is not always given accurately, many people wonder if there is an algorithm they can use to solve the Rubik’s cube in 20 moves. Nope. Keep in mind that even if you can solve the Rubik’s cube in 20 moves, these moves will be completely each time. And because of the large number of possible positions, this knowledge can be useful to solve a Rubik’s cube with a computer, but not for a person.

So if you want to learn how to solve the Rubik’s Cube, you better start by our tutorial

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