Impossible Wood Puzzle for Adults | 12 Piece Brain Teaser Handmade in Florida | Extremely Hard | The Calibron 12 Puzzle | Games For Adults

Welcome to Creative Crafthouse!

Our Calibron 12 Puzzle for Adults is a handmade brain teaser that will put your problem-solving skills to the test. Made with care in the USA by our small family business, this is one of our hardest puzzles, perfect for those who love a good mental workout.

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".
Why You’ll Love It:

Unique Design: Each puzzle's unique combination of woods makes it a beautiful addition to any collection.
Challenging Fun: Perfect for puzzle enthusiasts looking for a real challenge.
Quality Craftsmanship: Handmade with precision and care, ensuring a high-quality puzzle experience.
Support Small Business: By purchasing this wooden puzzle, you're supporting Creative Crafthouse, a small family business in the USA.
Perfect Gift:

Looking for the perfect gift or present for an engineer, know-it-all dad, smart (genius?) kid, puzzle lover, or brain teaser enthusiast? The Calibron 12 Puzzle is a great choice for birthdays, Christmas, holidays, or any special occasion. It's a gift that will be appreciated and enjoyed.

Historical Note:

Originally designed in 1933 by Theodore Edison, son of the famous inventor Thomas Edison, and made by his company Calibron Products of West Orange, N.J. It was offered as just pieces, and you were told they made a rectangle with only one solution. It turns out the only possible solution is a square shape, as verified by Ken Irvine's computer analysis. Ken is working on a full analysis of the puzzle, with excerpts noted below. I will link that analysis here when it is available.

Ken Irvine's Analysis:

After determining that there was only one solution to the square (using Burr Tools program), the second goal was to determine if there were any additional rectangles that could be made with the 12 pieces. The first step of this analysis was to determine how many possible rectangles needed to be checked. Since the total area of the pieces is 3136 units, the problem is to find the set of rectangles that have an area of 3136. This is done by factoring 3136 into its prime factors, which gives: 2 x 2 x 2 x 2 x 2 x 2 x 7 x 7. Rectangles of area 3136 can then be found by finding all combinations of dividing the prime factors into two sets. This can be further constrained by the fact that both sides need to be at least 18 units to be able to fit the 21 x 18 piece. This results in the following 4 possible rectangles, including the original square:
(2 x 2 x 2 x 7) x (2 x 2 x 2 x 7) => 56 x 56 (Original Square)
(2 x 2 x 2 x 2 x 7) x (2 x 2 x 7) => 112 x 28
(2 x 2 x 2 x 2 x 2 x 2) x (7 x 7) => 64 x 49
(2 x 2 x 2 x 2 x 2) x (2 x 7 x 7) => 32 x 98

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Made with care in our Hudson FL shop. Creative Crafthouse is a small family business and we appreciate your support.