Perplexing Pyramid Puzzle

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This is one of my favorite ball pyramid puzzles that was designed by Leonard Gordon in 1976. For years, Kadon Enterprises sold this puzzle made from clear polystyrene using injection molding (check out the photos). Although these puzzles are no longer available for purchase, you can read about their history on gamepuzzles.com and find them for sale on eBay. You might also see this same puzzle under different names. Puzzlemaster has a metal version called "Kugelpyramide" that's considered one of the most challenging 20-ball tetrahedron puzzles available. Two pyramids can be built using these pieces: a tetrahedron with a triangular base (hard) and a pyramid with a rectangular base (medium). The double-sided base plate allows you to build both pyramids, but requires supports. The single-sided base plate includes only the triangular base.