Direct solving (as opposed to reduction); to solve a large cube (4x4x4 and up) without reducing it to a 3x3x3 cube before the final steps. Some direct solving methods are:
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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.
