This story first aired on Feb. 23, 2016.

There's something about a secret compartment. Few know that better than Denver artist Kagen Sound, one of the world's top makers of puzzle boxes. His creations are made entirely of wood and only a careful sequence of moves can unlock the containers. 

Sound's work has won a worldwide following, says Jerry Slocum, the organizer of the annual International Puzzle Party where Sound has won more awards than any other designer. 

Colorado Matters visited Sound at his studio to unlock the secrets of a good puzzle.