• The Einstein Collection Lock Puzzle - 3D Brain Puzzles by Professor Puzzle.
• Contains a wooden puzzle lock with an attached metal key.
• Develop your problem solving skills - Can you slide the locks pieces around and unlock the padlock
• A perfect gift for any Physicist or Mind Puzzle enthusiast.
• Part of Professor Puzzles range of Wooden 3D Brain Teaser Puzzles & Adults Brain Teasers.