Void Cube

• abstract: The Void Cube is a 3-D mechanical puzzle similar to a Rubik's Cube, with the notable difference being that the center "cubes" are missing, which causes the puzzle to resemble a level 1 Menger sponge. The central "spider" used on the Rubik's Cube is also absent, creating holes straight through the cube on all three axes.

以上来源于: WordNet