The Puzzle Cube 7x7x7 is yet another higher order variation inspired by the original Rubik's Cube. It is sometimes referred to as the "V-Cube 7" becuase V-Cube were the first to mass produce this puzzle. The mechanism was invented by Panagiotis Verdes (who also invented the V-Cube 6x6x6) and it was patented in 2004. Manufacturers of this puzzle usually tend to make it a bit "pillowed" or rounded, originally probably due to the complexity of the mechanism but today as a cosmetic feature. It is important to note that while several manufacturers mass-produce this puzzle today, the Rubik's brand is not one of them. This puzzle is quite similar to the Rubik's Professor's Cube only it has 7 parts per edge instead of 5. As with all odd-order Rubik's Cubes variations, the centers of this puzzle are fixed in relation to each other and can be used as a reference point for solving the cube.
This puzzle is made of 8 corner pieces, 60 edge pieces and 150 center pieces, allowing an incredible amount of 1.95x10160 different combinations. Solving it, however, is not very different to any high-order Rubik's Cube with the reduction method: group the 5x5 centers, group the 5x1 edges, and solve like a regular 3x3x3 Rubik's Cube (accounting for parity cases).
The puzzle consists of 284 unique miniature cubes ("cubies") on the surface. Six of these (the central tiles of the six faces) are attached directly to the internal "spider" frame and are fixed in position relative to one another. Each piece (or quintet of edge pieces) shows a unique color combination, but not all combinations are present (for example, there is no piece with both red and orange sides, since red and orange are on opposite sides of the solved Rubik's Cube). The location of these cubes relative to one another can be altered by twisting the outer layers of the Cube 90, 180 or 270, but the location of the colored sides relative to one another in the completed state of the puzzle cannot be altered: it is fixed by the relative positions of the fixed center squares and the distribution of color combinations on edge and corner pieces. Currently, the V-Cube 7 is produced with white plastic as a base, with red opposite orange, blue opposite green, and yellow opposite black. The fixed black center piece is branded with the letter "V". Verdes also sells a version with black plastic and a white face, with the other colors remaining the same, solid plastic versions with the plastic the color itself and no stickers, flag variations of the 7x7x7 Rubik's Cube including Germany, Poland, Russia etc. The V-Cube 7 is noticeably rounded. This departure from a true cube shape is necessary, since the mechanism used on this puzzle would not function properly with layers of identical thickness. Other means (such as magnets) would be required. The rounded shape of the V-Cube 7 results in corner stickers that are similar in size to the center stickers, which helps hide the unequal thickness. The Rubik's Cubes from other manufacturers can be found with rounded or flat sides, but all use thicker outer layers.
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