A lock that doesn't need a key to open it!  Move the metal sliders around in their grooves until you can figure out how the lock comes apart. This version is made entirely of transparent acrylic which allows you to see the maze that is happening inside the lock as you are navigating the sliders.  This is the same puzzle as the original JP Lock Holz and the JP Lock Bronze, only in a different medium.
Made by Jean-Claude Constantin. Jean-Claude Constantin lives in Germany, where he designs and manufactures many different wood and metal puzzles, as well as magic tricks.
 

• See at Puzzle Master