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 Today's featured article The Last Layer Today's featured article is the Last Layer. The term last layer (normally abbrevated as LL, also called Last Slice) refers to the complete movable "layer" of a twisty puzzle which is the last to be solved in a Layer-By-Layer-related method. The last layer is the layer that must be solved on a cube when all of the other layers have already been finished. All pieces of the last layer can move together. Last layer is different from a last face: Rather than just including the stickers of the last side of a twisty puzzle, the last layer includes all of the stickers on all of the pieces of the last slice.

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 Today's featured picture This is the inside of a Dayan GuHong Version 1.

 Did you know For speedcubing, lookahead is more important than turning fast.

The 3x3x3 cube (also known as "Rubik's cube" and "magic cube") was invented by Ernő Rubik in 1974, and was quickly unveiled in the early 1980s.

This is a mechanical and geometric puzzle composed of with 26 elements (called cubies), which can be moved with a system of axes, that is hidden in the center of the cube. Each of the six faces is covered by 9 stickers, among six solid colours (traditionally being white, yellow, orange, red, blue, and green). The system of axes enables each layer to turn independently, thus mixing up the colours. For the puzzle to be solved, each face must be a solid colour.

It is said to be the world's best-selling toy, with over 350 millions cubes sold worldwide as of 2009.

It has inspired many widely available variations such the 2×2×2, the 3×3×3, the 4×4×4, the 5×5×5, larger sizes ones, the Pyraminx (tetrahedron), the Skewb Diamond (octahedron), the Megaminx (dodecahedron) or the Dogic (icosahedron). All of these items belong to a broad category of puzzles commonly referred to as "twisty puzzles". Some twisty puzzles are shape-shifting (such as the Square One) or custom-built (such as shape modifications of existing mechanisms).

Many subjects have been built around cubing:

Blindfolded solving

One-Hand solving

Feet solving

Puzzle building