True Genius Grecian Computer Wooden Math Puzzle

A dial-turning math brainteaser puzzle inspired by the astronomical computers of ancient Greece — rotate the layered dials until all 12 columns add up to 42. One of the hardest and best-selling puzzles in the True Genius collection. The rules take five seconds; the solve can take weeks. Stacked rotating dials create thousands of possible alignments, and only the right combination makes every column total 42 — a challenge worthy of the Grecian astronomers who inspired it. The flat, medallion-like design looks like an artifact on a desk, which is exactly where it tends to live between attempts. Why retailers stock it: A proven best seller with a devoted following — customers come in asking for it by name Easy to demo, nearly impossible to put down: staff hand it to a customer and the puzzle does the selling One-rule elegance appeals to math lovers, engineers, and gift buyers alike Fits bookstores, museum shops, science stores, and gift boutiques Details: Rotating-dial math puzzle — align all 12 columns to sum to 42 Approx. 5.9" x 5.9" x 1.1" Part of the True Genius collection of history-inspired brainteasers