Interlocking

RIBeye
RIBs
Rift
Rik's Kubusmix
Rob's Five Burr-ito
Robot
Roever variation II
Roll Cake
Rondo Turco
Rose
Rose
Rosebud
Rota#
RotaCube
Rotamove Cube
Rotator
Rotator
Rotothorpe #1