Ice-9A nine sided puzzle with 6 axes of rotation.
Icosidodecahedron Square-1Extensions were designed to give a Square-1 the shape of the icosidodecahedron which is a archimedean solid.
IcosidodecaminxA Pyraminx Crystal transformation by Tony Fisher. The name pretty much describes it's complexity.
IcositetranovaA Megaminx truncated into the shape of a tetrakis hexahedron.
Ivy KitesAn "ivy cut" trapezoidal icositetrahedron.
Jade PuzzleA 3x3x3 in shape of a Truncated Triakis Tetrahedron.
JumballA face-turning triakis tetrahedron with truncated shape. A jumbling-only puzzle.
Jumble DiamondA unique, near-jumbling-only twisty puzzle with a previously non-specified geometry.
Junior GemInspired by Dayan Gem VI this puzzle applies the same concept to a simpler geometry. It allows turns of 60° on some faces but is not fudged.
King Size KiteA Master Skewb with the shape of a deltoidal icositetrahedron which is a catalan solid.