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Other N-Sided: Four
PyraUfoAn Ufo stuck in midturn transformed into the shape of a tetrahedron.
Reuleaux Mastermorphix (aka Master Pyramorphinx)A 3x3x3 in shape of a Reuleaux tetrahedron.
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 TriamidArrange the ten pieces by breaking them into two groups and putting them back together again.
Ruby's TriangleA great little Pyramorphix clone.
Russian Pyraminx for the blindA pyraminx for the blind produced in the Soviet Union.

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.
Slice PyraminxA Pyraminx with the tips directly connected to the core.

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