I've seen this cake online before and a bride wanted it replicated for her husband on their wedding day. Each tier was 9 inches by 9 inches by 3 inches. Stacked on top of each other, this cake was 9 by 9 by 9. Phew! The squares were actually more intricate to make than anticipated. Everyone knows what a Rubik's cube is and so it had to be perfect. If those squares were even slightly off, the whole look of the cake would be off. In any case, I tried to be as precise as possible and it was SO much fun to make. The cake is buttery yellow cake layered with chocolate ganache. The whole cake is covered in marshmallow fondant. In order to get the edges as crisp as possible, I cut out the sides and top a few days in advance. I measured them out so that they would fit together and cover the cake perfectly. Then, after they dried and hardened, I simply aligned the edges and (sugar) glued them together.