Early civilizations shaped our world by solving puzzles. Faced with a problem, they were able to execute a creative solution. These brilliant innovations are the foundation of modern society and the mark of true genius.

The Aztec calendar is believed to be a way of tracking time according to the sun, with two wheels spinning to mark days and years. As the wheels spin, numbers align with hieroglyphs to represent the "tonalpohualli" and the "xiuhpohualli."

Turn the dials on this two-part puzzle until the sum of the numbers where the dials meet are all equal. Once you've solved one side, turn it over and solve the second puzzle on the other side.

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