Math CubeA shape variant to a mini 3x3x3 cube
Maybe CubeLike a modified Babyface Cube. The faces can't be turned but the moves that are possible allow for 45° steps.
Mega Axis Cube 3x3x3A 3x3x3 with three aditional layers of cubies and transformed into an Axis Cube.
Mess CuboidA mass produced 3x3x5 twisted into a pattern and afterwards extended.
Metal Ghost CubeThe inventor of the Ghost Cube rebuilts his creation - in metal.
Mezon HelicopterA Helicopter Cube jumbled into the Mezon state and modified back into the shape of a cube.
MF8 Square-1MF8s version from 2007. Produced in five different colors.
Micro Axis CubeA very popular shape transformation of the 3x3x3 dramatically reduced in size.
Mie Axis CubeA cubic 3x3x7 moved into a pattern and modified back into cubic shape.
Mirror Block 7x7x7This is a shape modification of a 7x7x7 cube that implements the same concept as the Mirror Blocks (aka Bump Cube).
Mirror BorgA bump cube (aka Mirror blocks) transformed like the borg cube
MirrormorphixA Mirror Blocks transformed like a Reuleaux tetrahedron.