### Who is Erno Rubik?Edit

Erno Rubik is the inventor of the Rubik's cube and several other puzzles. The Rubik's cube is a permutation puzzle, just like many other puzzles in the Rubik brand.

### What is a permutation puzzle?Edit

A permutation puzzle is a type of puzzle in which parts are moved around the puzzle in a limited number of ways. Depending on the number of parts and the restrictions on movement, the puzzle has a number of possible *configurations*, or *positions*. The higher the number of possible positions, the more difficult it will be to solve the puzzle, in general.

One of the oldest and best-known permutation puzzles is the Towers of Hanoi, which consists of three sticks and seven tiles on one of the sticks, stacked in descending size. The second and third stick are left empty. It is the goal of the game to put all tiles on the third stick, moving one tile at a time, where a bigger tile can never be on top of a smaller tile. This takes 127 moves.

The Rubik's Cube has an astonishing number of 43 quintillion possible positions, one of which is the solved case.

## Types of Rubik PuzzleEdit

### CubesEdit

- 2x2x2 (mini/pocket/junior/ice)
- 3x3x3 (regular)
- 4x4x4 (revenge/master)
- 5x5x5 (professor)

### SnakeEdit

### MagicEdit

### ClockEdit

## SolutionsEdit

## SpeedsolvingEdit

By speedsolving is meant solving a scrambled cube in the fastest possible time (bringing it back to its initial, solved position).

More on this topic can be found at the [speedcubing] website.

## TuningEdit

Tuning is the art of using tools and techniques to adjust the puzzle itself for the purpose of speedsolving. A puzzle can generally be tuned by

- lubricating (lubing), often with silicon spray(not oil-based)
- sanding
- adjusting: some puzzles have adjustable screws
- rebuilding: replacing original parts with (hopefully) better ones

and finally a common practice is restickering, which of course doesn't do much for the speed.

Read more on [Ton's pages]

## Creating puzzlesEdit

It's possible to create your own permutation puzzle. You could make a computer simulation of a known puzzle or invent a new computer permutation puzzle. Or you could create a real life puzzle. Most are made from plastic, and are hard to fabricate without specialized tools. It is noteworthy that the first Rubik's cube was actually made of wood!

Many other puzzles were influenced by Erno Rubik's puzzles. Later, more puzzles were created1(6x6x6-11x11x11, 17x17x17, pyraminx, megaminx, gigaminx, teraminx, petaminx, examinx, square-1 cube, square-2 cube, super square-1 cube, flower cube, 3x3x5, and much more.