iCubeA 3x3x3 four times truncated with spherical cuts into a concave solid.
Identity CrisisA megaminx-like puzzle transformed into the shape of a rhombic dodecahedron. It uses spherical cuts.
Illegal CubeA pentagonal prism which ignores geometric rules.
Jade CubeA special 3x3x3 which comes with becoming a member of Uwe Mefferts Jade Club.
Jade PyraminxSpecial edition of Jings Pyraminx for Meffert's Jade Club members.
JumblixA puzzle with the axis system of a face turning pentagonal dipyramid. Ten of 12 possible moves only jumbling.
Junior PrismA Pyraminx transformed into a concave triangular prism.