Online since 2002. Over 3300 puzzles, 2600 worldwide members, and 270,000 messages.

Moving: Hole
Hexagonal Missing LinkA hexagonal variant of the Missing Link puzzle.
Horrible HexagonA sliding piece puzzle with with an internal blockade.

Ideal Puzzle PenA strange puzzle from the cube craze which resembles a mixture between the ten billion barrel and Atomic Chaos.
Ingenious BallThis version was made in Taiwan.
Inside Out 2x2x2 Start (aka Vadasz Kocka)The solid colour, 2x2x2 version of the Vadasz cube.

Inside Out 3x3x3 Standard (aka Vadasz Kocka)The solid colour, 3x3x3 version of the Vadasz cube.
Inside Out 4x4x4 Profi (aka Vadasz Kocka)The solid colour, 4x4x4 version of the Vadasz cube.
Inside Out 4x4x4 Rainbow (aka Vadasz Kocka)The rainbow coloured 4x4x4 version of the Vadasz cube.

InversionA sliding blocks puzzle with only edges and corners.
IQ Magic CardA Moving Hole puzzle with 14 rows and 8 columns.
IQubeA well-designed 3D movable space puzzle.

ITC - Puzzle PenA 6x6 puzzle pen. Marketed by Ideal in 1982.
Ivory Tower (aka: Tower of Babylon)One of the more successful puzzles from the original cube craze.
Japanese Varikon 2x2x2A rare variant of Varikon 2x2x2 of japanese origin.

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Gear Cube Extreme

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Rubik's 360
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Eastsheen 5x5x5 (Dome)
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