Giant Pyramid Puzzle

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A challenging ball pyramid puzzle devised by Leonard Gordon is known to have been invented prior to 1980 by his brother Jerry Gordon. The Gordon Brothers began crafting this puzzle out of clear polystyrene, and from 1984 to 2018 it was sold through Kadon Enterprises. You can read more about the history of this puzzle on their website. In 2019, Kadon ran out of parts, making it impossible to purchase this puzzle, but now you can create one yourself by printing the pieces. If you prefer the clear look I recommend monitoring Ebay for used copies. This is one of the most difficult ball-pyramid puzzles ever created. The original solving time is estimated to range from "one hour to a year, or more." The final shape forms a tetrahedron with five balls along an edge. A total of nine pieces and thirty-five balls are involved in this puzzle. There is only one possible solution! I have written a document detailing the solution, which can be downloaded from my website.