Brain twister
Color-change puzzle game
Combination of cup/puzzle
Compensator for beam of balance scale of counterfeit coin-identi
Composite cubical maze puzzle
Concealed pattern detection game
Construction for three dimensional logical toy
Container with associated puzzle
Container with associated puzzle
Convertible interference sliding block type manipulable puzzle a
Crossword puzzle game and method of generating the same
Cube puzzle
Cube puzzle with moving faces
Cubic logic toy
Cubic puzzle
Cubical maze module
Cubicle maze puzzle
Cylindrical labyrinth puzzle toy
Cylindrical logical toy
Cylindrical slide puzzle