the v-cube 7 is a combination puzzle in the form of a 7×7×7 cube. the first mass-produced 7×7×7 was invented by panagiotis verdes and is produced by the greek company verdes innovations sa. other such puzzles have since been introduced by a number of chinese companies, some of which have mechanisms which improve on the original. like the 5×5×5, the v-cube 7 has both fixed and movable center facets.