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

Other N-Sided: Four
Reuleaux MegamorphixA 4x4x4 in shape of a Reuleaux tetrahedron.
Reuleaux UltramorphixA 5x5x5 in shape of a reuleaux tetrahedron.
Rex TetraA puzzle derived from the Rex Cube but with an additional set of pieces.

RexamorphixA Rex Cube in shape of a tetrahedron.
Rob's PyraminxA Halpern-Meier-Tetrahedron (aka Jings Pyraminx) without edges.
Royal PyraminxA Pyraminx with 6 layers.

Royal TetrahedronThe tetrahedral cousin of the Royal Skewb but invented earlier.
Rubik's PyramidA version of the Mastermorphix from the owner of the Rubik trademark.
Ruby's TriangleA great little Pyramorphix clone.

RX (Reuleaux Master Tetrahedron)A Master Skewb transformed into the shape of a Reuleaux Tetrahedron.
Semi-Bump TetrahedronA handmade Bump Cube transformed in to a rounded tetrahedron.
SencillaA Halpern-Meier Tetrahedron with trivial tips.

Shadow TetrahedronA face turning triangular dipyramid in shape of a tetrahedron with randomly shaped splines instead of straight cuts.
ShiftmorphixA Gear Shift in shape of a tetrahedron.
Si XiangA Duomo customly painted with figures steeming from chinese mythological.

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