Interlocking solid puzzles with sliding movement control...
Intersecting manipulable puzzle
Irregular polyhedron puzzle game with pieces of asymmetric shape
Knight-walk puzzle game
Labyrinth puzzle
Labyrinth type mental game machine
Logic game
Logic puzzle
Logic toy
Logical ball-shaped toy with broken surface including...
Logical deduction development game
Logical mosaic-puzzle
Logical plaything for improving spatial orientation and joint fo
Logical toy
Logical toy
Logical toy
Magic cube
Magic octahedron
Magic squares game
Magnetic detent device and puzzle game device