HipertwistA 3x3x3 with the shape redesigned into a loop-like shape.
IcoctahedronA face turning octahedron in shape of a non-regular icosahedron.
Ideal Cube 1x1x2Another mass produced version of the most primitive twisty puzzle.
Ideal Cube 1x1x3Another mass produced version of the second most primitive twisty puzzle.
Illusion MegaminxUnstickered Megaminx presented in a "checkerboard" pattern using white and black plastic parts.
Infinity LoopA continous loop of 34 marbles, intersecting but split at the same time.
Inverse-1The concept of the Square-1 got inverted in this puzzle. A closely relative to the Split 1x2x3 III but with eight segments.
Inverse-2A similar puzzle to the Inverse-1 but the edges on the middle layer were split into two halves.