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IcosmominxAn icosahedron with four cuts between two tips. The cutting depths were combined from the Icosaminx and Astrominx.
Illegal CubeA pentagonal prism which ignores geometric rules.
Imaginary CubeA combination of Enabler Cube and Crazy 3x3x3. I works like a subset of the Complex 3x3x3.

Impossible TwistA deeper-than-origin puzzle inspired by the impossible dovetail object.
Incomprehensible CubeA physical implementation of (UD', L, Ls, Fs). A 3x3x3 with a coupled pair of edges and two opposing sides coupled.
Indicator Cube 4 - The ATVA 4x4x4 with 24 gears inside the edge pieces.

InfinilabacusThree channels with extremely strong bends.
Insanity Double PlusA variant of Edge of Insanity with full four-way symmetry at the three new axes.
Insanity Plus PuzzleEdge-of-insanity-puzzle with three additional axes.

InvertiminxA megaminx, reduced to three sides, was turned inside-out.
Irreversible Cube A puzzle that is scrambled by just one move.
Ivy CrystalAn "Ivy Cut" rhombic triacontahedron, or a Pyraminx Crystal in disguise.

Ivy DodecIn solved state this puzzle looks like a reimplemented Trix but instead it works like a shape transformation of the 3x3x3.
Ivy FestivalA trapezoidal hexacontahedron with "Ivy" slices.
Ivy KitesAn "ivy cut" trapezoidal icositetrahedron.


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