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

Customly 3D-printed
Insane CubeThe HexaUfo twisted inside its solid.
Insanity Cube PlusA shape variant of a Meteor Madness with all faces showing the same cut pattern.
Insanity DodecahedronA 4 Corners Cube in shape of a dodecahedron.

Insanity FragmentationEdge of Insanity with one round of unbandaging but the same shape.
Insanity OctahedronAn Astroid Attack transformed into the shape of an octahedron.
Inside Track 1Four intersecting circles plus one ring of marbles.

Inside Track 2Four intersecting circles plus one ring of marbles movable in more than one configuration.
Inside Track 3Five intersecting circles with two types of pieces.
Inside Track PinwheelSeven rotating circles and one ring of moving marbles.

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.
IQ LollyA set of three puzzles differing only in size and the number of tiles.

Iron ManA 2x2x2 modelled to resemble the marvel character of the same name.
Ivy + Offset SkewbA corner turning hexahedron. A hybrid model which combines an Ivy cube with a offset Skewb.
Ivy MadnessThe easiest possible face turning triangular dipyramid in shape of a nine-sided solid.

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