The Calibron 12 Puzzle is an extremely difficult wooden brain teaser originally designed in 1933 by Theodore Edison. This handcrafted puzzle challenges you to fit 12 uniquely shaped pieces into a perfect squaretheres only one solution!

Why You'll Love It:

• Extreme Challenge: One of the hardest puzzles ever made.
• Premium Craftsmanship: Hand-cut from Ash, Maple, Walnut, and other fine hardwoods.
• Precision Design: Each piece is laser-engraved for a seamless fit.

A perfect gift for puzzle lovers, engineers, and collectors. Includes a solution guide in case you need help!