Tony Fisher Mastermorphix
Tony Fisher's Mastermorphix is the straight version of the pillowed mastermorphix. It changes shape when scrambled and, like the pillowed version has centre pieces which are sensitive to orientation.
Solving this puzzle is no different from the pillowed version. The problem is keeping track of which pieces are the edges, corners and centres. The tetrahedron shape disguises the fact that there are really 6 axes to the puzzle and that makes me do everything really slowly just to make sure that I'm not making any silly mistakes.