Online since 2002. The most comprehensive site for all around twisty puzzles.

Heptagonal Prism 2x2x2A 2x2x2 in shape of a heptagonal prism.
Heptagonal Prism 3x3x3A 3x3x3 in shape of the namegiving solid. None of the seven rectangular sides have an identical pattern.
HeptaminxA megaminx in shape of a pentagonal prism. Showing pentagrams on the top and bottom sides.

HexcubeA 2x3x3 reoriented in a strange way inside the shape of a cube.
Holey Skewb XtremeA Holey Skewb truncated like a Skewb Xtreme. Went into mass production.
Holey TetrahedronA holey variant of Jing's Pyraminx.

Icosa-4A 4x4x4 in shape of an icosahedron.
Impossible TwistA deeper-than-origin puzzle inspired by the impossible dovetail object.
Incognito CubeThis puzzle pretends to be a 4x5x5 but turns on an off centre axis.

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.
Irreversible Cube A puzzle that is scrambled by just one move.

Jumble DiamondA unique, near-jumbling-only twisty puzzle with a previously non-specified geometry.
Jumble PebbleA jumbling only puzzle with a strange yet unnamed geometry. It resembles the jumble rock.
Jumble RockA jumbling puzzle built around an unusual, currently unnamed shape.

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