1/0 VoidA Void Cube with four pieces cut away.
2x2x0A 1x2x2 made even easier.
2x2x2 PlanetarioMade with a 2x2x2 Witeden, removing half of the external pieces so that the internal 3x3x3 becomes visible and can be solved.
3 Square in 1Three samples of a Square-1 combined with what looks like a 2x2x2.
3/4 of 4x4x4One fourth of an Eastsheen 4x4x4 chopped away in a puzzle that is still functional.
30-Axes Wisdom WheelA variant of the Clover Cube with more pieces per turn and six additional turns corresponding to the face turns of a cube.