Burr

Rattle Twist Duo
Rebel
Rectangle Block (3D printed)
Rei Cube
Reza 4-4
Rhinoceros
Rhombic Maze Burr
Ribbons
Rimmon
Ringeling
Ringeling 3
Ringeling 4
Rock-it Burr
Rocoto
Rombak
Rombo
Roxanne and George Puzzle
Rubus Cube
Rug-Rug
Russian 11
S/M24