Hollow 1x2x2Probably the most minimalistic twisty puzzle although by far not the most trivial to make.
Houlis CubeA puzzle which is based on the fourth dimensional symmetry 4D polytope known as hexadecachoron (or 16-cell).
HX-CubeThe concept of the "Space Cube" applied to a mass produced Fisher Cube.
IcosacopterThe Icosacopter is a deeper cut edge turning icosahedron. It is deeper cut because the center pieces (the middles of the edge) are in no way able to connect directly to the core.
IcosaixA face turning icosahedron. Not the first one but the first to reveal the jumbling geometry of this type of puzzles.
IcosamateA Pentultimate in shape of a icosahedron => A deepcut corner turning icosahedron.
Icosidodecahedron Square-1Extensions were designed to give a Square-1 the shape of the icosidodecahedron which is a archimedean solid.