Ancient bone dice reveal 12,000-year history of gambling in America

Native American hunter-gatherers were making and using dice over 12,000 years ago. This happened thousands of years before similar tools appeared anywhere else. These bone "binary lots" were like early coins, used for games of chance.

A new study shows these were not accidental objects. They were carefully designed tools used across many regions and cultures. This research was led by Robert J. Madden, a Ph.D. student at Colorado State University.

The study, published in American Antiquity, provides strong evidence for these early dice. These discoveries come from the western Great Plains at the end of the last Ice Age. They are thousands of years older than the oldest known dice from Bronze Age societies in the Old World.

Madden noted that historians usually thought dice and probability were Old World ideas. He explained that the archaeological record shows ancient Native American groups intentionally made objects to create random outcomes. They used these outcomes in structured games much earlier than previously thought.

What Ice Age Dice Looked Like

The oldest dice found are about 12,800 to 12,200 years old. Unlike modern six-sided dice, these were two-sided pieces called "binary lots." They were carefully shaped from bone. They were small, flat, or slightly rounded, often oval or rectangular, and designed to be tossed.

Each piece had two different faces. These were marked by color, texture, or designs, like heads and tails on a coin. One side was the "counting" face. When thrown, each piece would land showing one side or the other, giving a two-outcome result. Players threw several pieces at once. The game's outcome depended on how many landed with the counting face up.

Madden described them as "simple, elegant tools" that were "unmistakably purposeful." He added that they were not accidental bone pieces but were made to create random outcomes.

A New Way to Find Ancient Dice

The study created a new method to identify dice in archaeological collections. This method uses a checklist of physical features. It's based on comparing 293 sets of historic Native American dice. These were recorded by ethnographer Stewart Culin in 1907.

Using this method, the study re-examined artifacts previously called "gaming pieces" or ignored. By applying clear rules, Madden could tell if these objects were indeed dice.

Many of these items had been known for decades but were not seen as part of a larger pattern. This new approach identified over 600 definite and likely dice. They came from sites covering every major period of North American prehistory, from the Late Pleistocene through European contact.

Madden said the evidence was already there, but a clear, continent-wide standard for recognizing dice was missing. The earliest examples were also directly examined in museum collections. These included the Smithsonian Institution, the University of Wyoming Archaeological Repository, and the Denver Museum of Nature and Science.

Rethinking Probability's Beginnings

Dice games are often seen as humanity's first structured way of dealing with randomness. They helped lay the groundwork for probability theory and statistics. Until now, experts believed these practices started in complex Old World societies about 5,500 years ago.

These new findings suggest a much earlier and wider origin. Madden clarified that the findings don't mean Ice Age hunter-gatherers were doing formal probability theory. However, they were intentionally creating and using random outcomes in repeatable, rule-based ways. This used probabilistic ideas like the law of large numbers. This changes how we understand the global history of probabilistic thinking.

A Lasting Cultural Tradition

The research also shows how common and long-lasting dice games were in Native American cultures. Dice evidence appears at 57 archaeological sites across 12 states. This covers Paleoindian, Archaic, and Late Prehistoric periods. It also reflects many different cultural traditions and ways of life.

Madden believes this long history shows the important social role of games of chance. He said these games created neutral, rule-governed spaces for ancient Native Americans. They allowed different groups to interact, trade goods and information, form alliances, and handle uncertainty. In this way, they acted as powerful social tools.

Deep Dive & References

Probability in the Pleistocene: Origins and Antiquity of Native American Dice, Games of Chance, and Gambling - American Antiquity, 2026