The Void cube is a puzzle based on the 3x3x3 cube. It features a different mechanism that makes the puzzle entirely hollow. Unlike the normal 3x3x3 cube, it does not feature centers. It can be solved like a normal cube, except that the absence of centers allows for two corners or two centers to be swapped with the rest of the cube solved, which is not possible on the normal cube. This situation can be resolved by doing a 90 degree E slice move, taking out the middle layer edges, putting them into their correct spots, and then solving the last layer.
- Removing just the centres gives a cube which is particularly perplexing. Half the times one tries to restore it in a pattern that has a 4-cycle of the centres, but this is not visible because the centre stickers are missing. However, such a pattern is impossible and one finds that it requires an odd permutation of the edges to complete it. This is done by a slice move which also gives the desired odd permutation of centres.
The void cube itself was invented by Katsuhiko Okamoto, and it won the Jury Grand prize at the Nob Yoshigahara Puzzle Design Competition at IPP 2007 (International Puzzle Party 2007).