Speedcubing (also known as speedsolving, or just cubing) is a sport involving solving a variety of combination puzzles, the most famous being the 3x3x3 puzzle or Rubik's Cube, as quickly as possible. For most puzzles, solving entails performing a series of moves that alters a scrambled puzzle into a state in which every face of the puzzle is a single, solid color. Some puzzles have different requirements to be considered solved, such as the Clock, for which all the dials must be moved into the 12 'o clock position. The standard puzzle sizes are 2x2x2, 3x3x3, 4x4x4, 5x5x5, 6x6x6, and 7x7x7 and the different variations of speed solving, 3x3x3 one-handed, 3x3x3 blindfolded, 4x4x4 blindfolded, and 5x5x5 blindfolded. There are also different shapes of the famous puzzles, including Pyraminx, Megaminx, Skewb and Square-1. An individual who competes in speedcubing is known as a speedcuber.