Jr. Heli-SkewbA hybrid that combines three axis systems: 2x2x2, Skewb and Helicopter Cube.
KantikubA puzzle combining the Mixup Cube with a crazy cube and an edge turning cube.
Kite StarA 3x3x3 with distorted but regular pieces.
Krystian's CubeA 2x2x2 with a twist that defies all attempts of classifying.
Ladder CubeA hybrid of corner turning (skewb) and edge turning (very shallow) hexahedron.
Lattice XA hybrid puzzle of Super-X and Lattice Cube
Link Cube PlusA cubic version of the Coin Rhombic Dodecahedron with additional 2x2x2-turns.