Susan's Books & Gifts

Are you up for our most challenging puzzle?

With a difficulty rating of 5/5, this puzzle tests your mathematical reasoning and patience — a rewarding brain workout for ages 14 and up. Stuck? Every puzzle includes a free online solution video, so the challenge never turns into frustration. Can you master this homage to the world’s first known analog computer?

Align the dials to solve this ancient Greek mathematical challenge.

• Ages: 14+
• Difficulty: 5/5 — our most challenging puzzle
• Type: Math brainteaser · 1 player
• Includes: Wooden dial puzzle + free online solution video
• Screen-free and display-worthy — a smart gift for engineers, math lovers, and history buffs

Step into the world of ancient Greek ingenuity with the Grecian Computer, a puzzle inspired by the brilliance of early astronomers and the groundbreaking Antikythera mechanism. Turn the dials until all 12 columns align perfectly, each adding up to the number 42.