Krystian's TwistA subset of the Big Chop in shape of the tridiminished icosahedron.
Long ShotA 2x2x7 implemented with a design that allows its extension to infinity.
Loopy TwistA toroidal twisty puzzle in the vain of Tricky Disky with just one type of piece.
Magic BagelFour rings of marbles with two cylinders synchronized by gears.
Maltese GearsA combination of the Geared Mixup and the Void Cube.
MastrolabacusA bigger version of Astrolabacus with five grooves. Maybe the first puzzle with moving marbles that jumbles.
Matryoshka Spheres PuzzleFive Treasure Skewbs designed to to fit inside of each other just like the famous dolls of the same size.
Maybe CubeLike a modified Babyface Cube. The faces can't be turned but the moves that are possible allow for 45° steps.
Melty AOne out of a series of geometries with 6 axes but at 85 degrees to each other. This one is symmetric like a corner piece of a regular 3x3x3.
Melty BOne out of a series of geometries with 6 axes but at 85 degrees to each other. This one has just one rotational symmetry.
Melty COne out of a series of geometries with 6 axes but at 85 degrees to each other. This one has just one mirror symmetry.
Melty DOne out of a series of geometries with 6 axes but at 85 degrees to each other. This one has just five rotational symmetries.
Meteor MadnessA jumbling twisty puzzle based on the geometry of a triangular dipyramid.
Minimal 3x3x3A minimalistic 3x3x3 designed after the 7x7x7 from the same inventor.

