Interlocking Puzzle | The Keystone

Interlocking Puzzle: The KeystoneTest your wit and patience with The Keystone, a deceptively simple-looking interlocking block puzzle designed for 3D printing. The challenge is simple but satisfying: transform 12 separate blocks into a single, solid geometric object. While 11 of the blocks are identical and easy to piece together, the structure remains incomplete and unstable until you introduce the 12th piece—The Keystone. Featuring a strategic cutout, this final block is the literal "key" that slides into the crux of the puzzle, locking all other components into a rigid, unified shape.How it WorksThe Build: Assemble the first 11 identical pieces to form the shape.The Crux: Find the specific orientation and path required to slide the Keystone into place.The Result: A perfectly interlocked desk trophy that won't fall apart until you remove the key.Puzzle SpecsDifficulty: 2/5Estimated Solve Time: about 60 minutesParts: 12 total (11 Identical Blocks, 1 Keystone)Print Instruct