利用者:キュアラプラプ/サンドボックス/戊

Do you know the world record for solving a Rubik's Cube fastest? It is only 3.47 seconds. Too fast! Well, I am sorry if anyone expects a speech about speedcubing, because I will now introduce some Rubik's Cubes which have interesting shapes.

But first, I will introduce the most known, basic 3x3x3 cube. It was designed by Rubik Ernő, a Hungarian professor of architecture. Soon after the release, this attractive three-dimensional puzzle became very popular all over the world. So a few years later, a new Rubik's Cube designed more difficult followed it. This one was a 4x4x4 cube, called "Rubik's Revenge."

More and more complex and large Rubik's Cubes have appeared one after another since then. A 5x5x5 cube called "Professor’ Cube," then 6x6x6, 7x7x7... Okay, The largest Rubik's Cube that really exists today is the 33x33x33 cube, which is created by a French designer named Grégoire Pfennig and listed in Guinness World Records as such.

On the other hand, there is a simpler one: 2x2x2 cube called "Pocket Cube." In fact, this cube is not a child of the Rubik's Cube. It was created by an American chemist named Larry D. Nichols, before Rubik Ernő developed the Rubik's Cube.

Some types of Rubik's Cubes are no longer "cubes". For example, this is a tetrahedron-shaped Rubik's Cube called "Pyraminx," created by a German designer named Uwe Mèffert. There are a variety of other geometric shapes, such as "Decamynx" in the form of a dodecahedron, "Dogic" in the form of an icosahedron, and even "Rubik's Sphere" in the form of a very sphere.

Other Rubik's cubes are also no longer "cubes," in terms of dimension. Those cubes exist in virtual space, not in reality. This is because they are not three-dimensional objects. Please look at this 4D Rubik's cube. Too strange! I have no idea how to handle this, much less how to solve it. There are also a 5D cube, then 6D, 7D... However, the most interesting one among the non-three-dimensional Rubik's Cubes is, I think, this two-dimensional "Rubik's Square."

Like this, there are many Rubik's Cubes that have interesting shapes. Looking at a 3x3 cube now, doesn't it look so easy? If you think so, why not challenge a Rubik's Cube? Thank you for listening.