Reciprocating manipulable ball puzzle
Recreational didactic multicombinable device
Regular polyhedron puzzles
Regular polyhedron-based logical puzzles
Resettable puzzle
Rotary puzzle device
Rotatable connected object
Rotatable manipulable puzzle
Rotatable puzzle with octahedral base and connected tetrahedral
Rotating amusement device
Rotating spheres puzzle
Rotational cubic puzzle
Rotational ring puzzle
Row-forming marble board game
Self-contained competitive game for developing spatial sense in
Self-limiting single player game
Shiftable block puzzle
Shiftable block puzzle
Shiftable element puzzle
Simulated space station puzzle game