Tic-Tac-Toe feels like it has always existed — and in a sense, it nearly has. Variations of the three-in-a-row concept have appeared on every inhabited continent, carved into roofing tiles, scratched into temple floors, and scrawled on the backs of homework assignments. Its history stretches back thousands of years.

Ancient Egypt — The Earliest Grids

Archaeologists have discovered 3×3 grid carvings on roofing tiles at the temple of Kurna in Egypt, dating to roughly 1300 BCE. While the exact rules these ancient players followed remain uncertain, the boards are unmistakably the same grid we recognize today. Similar grids appear on pottery fragments and stone slabs throughout the ancient Near East.

Rome — Terni Lapilli

The Romans played a game they called terni lapilli, meaning “three pebbles.” It used a 3×3 grid, but with an important twist: each player had only three pieces. Once all six pieces were on the board, players took turns sliding a piece to an adjacent empty square. The goal was still three in a row, but the movement phase added a layer of tactical depth absent from the modern pen-and-paper version.

Terni lapilli boards have been found carved into paving stones, columns, and steps throughout the Roman Empire — from the Forum in Rome itself to outposts in Britain and North Africa. Soldiers likely scratched boards wherever they camped.

Medieval and Early Modern Europe

Three-in-a-row games persisted through the Middle Ages, often under regional names. In England, the game was linked with “three men’s morris,” a close relative that also involved sliding pieces. By the 18th century, the pen-and-paper version — where marks are placed permanently — had become the dominant form in British schools and households.

Noughts and Crosses — The British Name

The name Noughts and Crosses first appeared in print in the late 19th century. “Nought” is the British term for zero, describing the O mark, while “cross” describes the X. This name remains standard across the United Kingdom, Australia, New Zealand, South Africa, and many other Commonwealth nations.

Tic-Tac-Toe — The American Name

In the United States, the name Tic-Tac-Toe (sometimes hyphenated) became the accepted term during the 20th century. Confusingly, earlier uses of “tick-tack-toe” in American English referred to entirely different games — sometimes a version of backgammon, sometimes a game involving tossing objects at numbered squares. By the mid-1900s, the name had settled firmly on the 3×3 grid game we know today.

The Computer Age

In 1952, a University of Cambridge doctoral student named Sandy Douglas created OXO, one of the first video games ever made. It ran on the EDSAC computer and allowed a human player to compete against the machine at Noughts and Crosses. OXO demonstrated that a computer could play a perfect game, always drawing or winning.

By the 1970s, Tic-Tac-Toe had become a standard introductory project for computer science students learning about game trees, artificial intelligence, and the minimax algorithm. The game’s small search space made it an ideal teaching tool — a role it still fills today.

Modern Day

Tic-Tac-Toe remains ubiquitous. It is played on paper in classrooms, on phones in waiting rooms, and in browser-based apps around the world. Its variants — including Ultimate Tic-Tac-Toe and 3D Tic-Tac-Toe — have expanded the concept for players who crave more strategic depth. Meanwhile, the original 3×3 game endures as the world’s most accessible introduction to strategic thinking.

A Timeline at a Glance

  • ~1300 BCE — Grid carvings appear in ancient Egyptian temples
  • ~100 BCE – 400 CE — Romans play terni lapilli across the empire
  • 500 – 1500 CE — Three-in-a-row variants persist through medieval Europe
  • 1800s — Noughts and Crosses becomes a pen-and-paper staple in Britain
  • 1900s — The name Tic-Tac-Toe settles into American English
  • 1952 — OXO becomes one of the first computer games
  • 1970s–present — The game serves as a foundational example in computer science education