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In a classic Rubik's Cube, each of the six faces is covered by 9 stickers, among six solid colours (traditionally being white, yellow, orange, red, blue, and green). A pivot mechanism enables each face to turn independently, thus mixing up the colours. For the puzzle to be solved, each face must be a solid colour.
The Cube celebrated its twenty-fifth anniversary in 2005, when a special edition was released, featuring a sticker in the centre of the reflective face (which replaced the white face) with a "Rubik's Cube 1980-2005" logo, and different packaging.
There exist four widely available variations of the Cube: the 2×2×2 (Pocket Cube, also Mini Cube, Junior Cube, or Ice Cube), the standard 3×3×3 cube, the 4×4×4 (Rubik's Revenge, or Master Cube), and the 5×5×5 (Professor's Cube). Recently, larger sizes are also on the market (V-Cube 6 and V-Cube 7).
For readability, 3x3x3 is frequently abbreviated 3×3 (and similarly for the other sizes) when there is no ambiguity. Common misspellings include "Rubix cube", "Rubics cube", "Rubick's cube", and "Rubiks cube".
The Cube has inspired an entire category of similar puzzles, commonly referred to as twisty puzzles, which includes the cubes of different sizes mentioned above, as well as various other geometric shapes such as the tetrahedron (e. g., the Pyraminx), the octahedron (e. g., the Skewb Diamond), the dodecahedron (e. g., the Megaminx), and the icosahedron (e. g., the Dogic). There are even higher-dimensional virtual puzzles, simulated by computer software that lets the user manipulate objects such as a 4-dimensional Rubik's cube, which cannot be physically built.
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