Our Calibron 12 Puzzle for Adults is a handmade brain teaser that will put your problem-solving skills to the test. 

Product Details:

Difficulty: Extremely challenging (impossible even?!) with only one solution.
Packaging: We send the puzzle unsolved, with the solution guide included. One piece is held in an extra space within the frame for easy packaging.
Materials: Crafted from precision-cut woods, each puzzle features at least four different types of wood, such as Ash, Maple, Walnut, Oak, Mahogany, Birch, Cherry, and Alder. This ensures every puzzle has a unique look.
Durability: Each piece is 1/4" thick, making the puzzle strong and durable.
Engraving: Laser-engraved sizes on each piece help you identify and solve the puzzle, whether you're attacking it analytically or using the provided instructions.
Dimensions: Puzzle measures 9" x 7" in the base with a square opening of approximately 6.3" x 6.3".