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

NxNxN: 4x4x4
Checker Cube aka Chess Cube aka Checker BoardA black-and-white 4x4x4. Still not trivial to solve.
Clockwork 4x4x4A 4x4x4 with all layers of one dimension linked into one coordinated movement.
Cornerless 4x4x4 IIA 4x4x4 without corners and without the shape of a hexahedron.

Crazy 4x4x4The first 4x4x4 with circles. It exposes the theoretical inner 2x2x2.
Crazy 4x4x4 IIThe next logical step after the Crazy 4x4x4. A very clever implementation of the Super Crazy 4x4x4.
Crazy 4x4x4 IIIThe third 4x4x4 with circles on all six sides. The circles are larger as in the first two variants.

DémineurA 4x4x4 with a theme based on Minesweeper.
Dia-Cube 4A 4x4x4 bandaged with a known pattern of a smaller bandaged cube in one corner.
Eccentric CubeLooks like a 4x4x4 but is a 3x3x3 with three additional layers of cubies.

Eight Colour RevengeAn interesting custom variation of a 4x4x4.
Elvi-bandaged 4x4x4A 4x4x4 bandaged with 8 bonds, one for every corner.
Fence Cube (bandaged 4x4x4)A bandaged 4x4x4 named after a fence.

FMT - Fast Moving TruckFast Moving Truck - A Logistic Company
Four-color stickerless 4x4x4 cube4x4x4 stickerless cube where every layer has its own color.
Framed CubeA 4x4x4 reduced to the maximum! The inner 2x2x2 is visible and has to be solved too.

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