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

Customly 3D-printed
Quantum EntanglementFour 2x2x2s arranged in tetrahedral shape. Every side's rotation is linked to the rotation of another cube.
Quartered Edges 2x3x3A 2x3x3 with edges cut into quarters. Could be viewed as a bandaged 6x6x6.
Radiating CheeseRubiks Cheese resembling the radioactivity symbol.

Radio 3 OctahedronA Radiolarian 3 (a face turning icosahedron) redesigned to have the shape of an octahedron.
Rail-less 8 segment cheeseA rail-less one-layered Masterball in shape of a cuboid.
Rainbow 9-axes OctahedronA nine-axes turning octahedron, using a geometry developed by Diogo Sousa.

Rainbow cube dodecahedronA Dino dodecahedron redisgned into the shape of a icosidodecahedron, an archimedean solid.
Raptor BallA spherical version of the Proportional-Oh-Cube but from a different designer.
RaskewbThe Mental Box after a 180 turn reshaped into a cube.

RCP CentroidA 3x3x3 in the shape of four intersecting cylinders.
RD PentultimateA Pentultimate in shape of a rhombic dodecahedron.
Redi bumpA bumped version of the Redi Cube.

Restricted Crazy Junior BarrelThe Crazy Junior Barrel with some constraints.
Reuleaux CrystalminxA Pyraminx Crystal in shape of a reuleaux tetrahedron.
Reuleaux TobleroidA five layered triangualr prism roughly in the shape of a bar of the famous swiss chocolate.

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