RARE IPP25 Exchange Puzzle: "HIDDEN" by Teijo Holmsten (Finland, 2005)

The Ultimate Test of "Blind" Deduction

​Up for sale is a pristine example of "HIDDEN," the highly sought-after exchange puzzle from the 25th International Puzzle Party held in Helsinki. Designed and handcrafted by acclaimed Finnish maker Teijo Holmsten, this piece is a masterclass in minimalist aesthetics and deceptive internal engineering.

​The Challenge

​At first glance, "HIDDEN" appears to be two solid, interlocking blocks of contrasting premium hardwoods. There are no visible hinges, no external slides, and no clues. Your objective? Separate the two wooden halves. To solve it, you must rely entirely on tactile feedback and logic. The internal mechanism is "blind," meaning the solution stays true to the name—it is completely hidden within the soul of the wood. It requires a specific sequence of movements that will challenge even seasoned mechanical puzzle enthusiasts.

​Craftsmanship & Condition

• ​Designer/Maker: Teijo Holmsten (Finland)
• ​Materials: Two contrasting high-grade hardwoods with a signature silky-smooth Finnish finish.
• ​Provenance: Official IPP25 Exchange Puzzle (Limited Edition).
• ​Includes: Original designer’s information and objective card.
• ​Condition: Excellent. The wood has been well-maintained, with no swelling or "blooming," ensuring the internal mechanism moves exactly as the designer intended.

​Why Add This to Your Collection?

​Teijo Holmsten’s work is legendary among the IPP community for its tactile elegance. Because exchange puzzles are produced in strictly limited quantities for event participants, "HIDDEN" rarely surfaces on the open market. This is a rare opportunity to own a piece of 2005 Helsinki puzzle history.

​A centerpiece for any serious mechanical puzzle or "Secret Opening Box" collection.

Shipping determined at close of auction.