7x7x7 Cube

The 7x7x7 cube (normally referred to as the 7x7x7 or 7x7) is a twistable puzzle in the shape of a cube that is cut six times along each of three axes. The first brand of this puzzle was the VCube 7, whose inventer, Panagiotis Verdes, patented. Many other cube companies have produced puzzles very similar, but these are considered knockoffs due to using the same basic mechanism. The V Cube 7 is rounded (or 'pillowed') because it is mathematically impossible to make a perfectly cubical 7x7x7 cube without any kind of magnets or locking mechanism, as the corners would fall off.
Shengshou have made a cubic 7x7, and it has become very popular, particularly the smaller version. MoYu have also made a 7x7 called the AoFu, which has a pillowed shape like the VCube 7. Moyu has since released a cubic version of the AoFu, called the Cubic AoFu GT.
This puzzle has 6 fixed centers, a total of 144 other center pieces, a total of 60 edge pieces, and 8 corners, and has 2.0 * 10^160 positions.
See also
 VCube 7
 VCube (manufacturer)
 7x7x7 Speedcubing Methods
 The Wikipedia article
