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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.
iX CubeA redesigned Super X with internals corners that have visible orientation.
Jack's CubeA puzzle which combines three different concepts in one puzzle.

Jailbreak Cube (Latch III Cube)A latch-based method to bandaged a 3x3x3. It allows a whole series of variants.
Jewel OctahedronAn edges-only 3x3x3 in shape of a negatively stellated octahedron. It is the octahedral equivalent of the Alexander Star.
Jewel TetrahedronA Dino tetrahedron redseigned to be concave.

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