MausoleumA painted 3x3x3 with reduced pieces and a creepy scheme.
Mayan CubeA 3x3x3 which implements a new way of bandaging. It makes use of many beautiful L-shaped pieces.
Maze 3x3x3A sticker variant that combines the Maze Cube with the classical 3x3x3.
Maze Cube (3x3x3)A 3x3x3 custom sticker variation, filled with mathematical considerations, which shows a single closed loop line on it.
Maze-300 cubeA bandaged 3x3x3 with a gods number (measured in QTM) of 301, a record holder.
McDonald's CubeApparently only given to managers at an important meeting of some sort.
Meat CubeA 3x3x3 covered with stickers showing different pieces of meat.
MedusozoaA Cutter Cube truncated into an octagonal barrel and painted with two jellyfishes.
Mega Axis Cube 3x3x3A 3x3x3 with three aditional layers of cubies and transformed into an Axis Cube.
MegaCube IEight 3x3x3s connected with twelve bridges each consisting of a single cubie glued to adjacent edges.
MegaCube IIEight 3x3x3s connected with twenty four bridges each consisting of a single cubie glued to adjacent corners or edges.