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Six-Sided: Cube (Shape Preserving)
Lucky Clover CubeA contour cut variant of Oskar's Redi Cube.
Master Curvy CopterA two-layer, curvy, dual-jumbling, edge-turning cube.
Master Curvy Copter PlusAs the name suggest this puzzle combines the properties of Master Curvy Copter and Curvy Copter Plus.

Master Helicopter CubeAn edge-turning hexahedron with four plane cuts per axes.
Master Rex CubeA corner-turning hexahedron with 7 types of pieces. All cuts still intersect at the corners.
Master SkewbAn incredible creation by Katsuhiko Okamoto. A very rare puzzle for many years it became mass produced in 2011.

Master Skewb 3x3x3A hybrid puzzle of a face-turning and corner-turning hexahedra. In this case the cutting depth of a 3x3x3 and a Master Skewb are combined.
Mayan CubeA 3x3x3 which implements a new way of bandaging. It makes use of many beautiful L-shaped pieces.
Mercedes CubeA 3x3x3 with unusually cut circles which can be turned independently.

Mercedes Cube IIIt looks very similar to the Mercedes Cube I but this combines cornerturns with turns of the circles.
Mercury Uniaxial 3x3x3A slight modification of the Deep Uniaxial 3x3x3.
Mess Cube 4An Eastsheen 4x4x4 modified to look like a 5x5x5 it internally is. The internal bandaging was removed and replaced by an external one.

Micro 24-CubeAlso known as "Little Chop" but with an edge length of just 30 mm.
Micro SkewbA Skewb ith 23 mm edge length
Missing Edge VoidA Void Cube with one edge removed. It works like a bandaged Void Cube.

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