The mf8 Son-Mum Cube is a 3x3 mixup cube designed by Mike Ambrust and produced by mf8. It features an outer 3x3 with a smaller 3x3 located on each center. As with most mixup style cubes, it is possible to scramble the inner 3x3 along with the outer 3x3 at certain irregular points, which allows the puzzle to be scrambled in some unconventional ways. It features both the Mike Ambrust and official mf8 logo.