3x5x5 (quasi olzed)A fully functional cuboid handmade from a 5x5x5 without square tiling on top and bottom.
3x7x7 (extended)A 3x7x7 cuboid, built with extension on pieces of a reduced 7x7x7.
Beatle CubeShape variant of a regular 3x3x3 with two faces.
Boney CubeA 3x3x3 reduced as heavily as possible, not only in shape but also in mechanism.
BrainballSpin the number ring, and twist the ends to flip seven of the thirteen numbers over.
Bram's MagicSix ball connected in a loop. The moves defy everything you might know from twistypuzzles.