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There is no single, definition-free answer to “What was the first computer game?” The answer depends on whether you mean a game played on a computer, a machine built to play a game, a graphical display, or a project made chiefly for entertainment. The early history is clearer as a sequence: Nimrod demonstrated computing in 1951, OXO explored human-computer interaction in 1952, Tennis for Two entertained visitors in 1958, and Spacewar! spread through technical communities in 1961–62.
Why “the first computer game” has more than one answer
Early computing projects did not fit today’s neat categories. Some used computers to demonstrate processing; others were research programs, visitor attractions, or experiments in what a graphics-capable machine could do. Their displays also differed: fixed lights, a cathode-ray tube (CRT), or an oscilloscope.
Brookhaven National Laboratory cautions that “it would not be fair or correct to award the title of ‘the first video game’ to any one of these specific inventions” (Brookhaven’s history of Tennis for Two and early video-game claims). The most useful approach is to name the criterion: earliest documented predecessor, early computer game, graphical computer game, game designed for amusement, or influential game circulated among computer users.
Early milestones in computer-game history
| Year and project | Machine, display, and input | Purpose and access |
|---|---|---|
| 1948 — Cathode-Ray Tube Amusement Device | Patented device; screen with physical overlays representing targets. It was not described as running on a general-purpose computer. | A documented video-game predecessor. The overlays mean its visuals were not all generated electronically. |
| 1951 — Nimrod | Ferranti computer; fixed lights represented the Nim game. Players removed matches from piles. | Built to demonstrate computer processing. It debuted at the Festival of Britain on April 12, 1951, and was later dismantled after a Berlin showing. |
| 1952 — OXO | EDSAC computer; a 35 × 15 dot CRT showed the tic-tac-toe board. Players entered moves with a rotary telephone dial. | Alexander Douglas’s human-computer interaction research project; few people outside Cambridge played it. |
| 1958 — Tennis for Two | Donner Model 30 analog computer; oscilloscope display and controllers. The simulated ball followed simple physics, and the display sounded when it was hit. | Designed for fun as a Brookhaven National Laboratory visitor-day attraction; shown again in an improved form in 1959. |
| 1961–62 — Spacewar! | MIT’s DEC PDP-1; a star-field display and controls for two ships, the Wedge and Needle. Players fired at one another while contending with gravity. | Created by Steve Russell, Martin Graetz, and Wayne Wiitanen, with important early development by Russell and improvements by Peter Samson, Dan Edwards, and Graetz. It spread through technical and university computing communities via DECUS. |
The timeline draws on the Computer History Museum’s computer timeline, its overview of early computer games, and Brookhaven’s institutional account.
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What each milestone contributes
1948: a video-game predecessor, not a computer game in the modern sense
Thomas T. Goldsmith Jr. and Estle R. Mann’s Cathode-Ray Tube Amusement Device is an early documented predecessor in Brookhaven’s account. Physical overlays in front of the screen supplied the targets, so calling it a computer game without qualification would go beyond what the source establishes.
1951: Nimrod made computer processing visible
Ferranti’s Nimrod played Nim, but its fixed lights rather than moving CRT imagery made the machine’s computational process part of the demonstration. Ferranti employee John Bennett suggested the project; Raymond Stuart-Williams engineered it from Bennett’s design. Its public showing makes it a major early computer-game machine, though its primary purpose was demonstration rather than amusement.
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1952: OXO brought a graphical game to a research computer
Cambridge PhD candidate Alexander Douglas wrote OXO for EDSAC while researching human-computer interaction. The player could choose who moved first, then enter moves using a rotary telephone dial. The CRT displayed a board in dots. OXO therefore fits “early graphical computer game” well, but it was a research program rather than a commercial release.
1958: Tennis for Two was made to entertain visitors
Physicist William Higinbotham devised Tennis for Two for Brookhaven’s annual visitor day. Two players used controllers to rally a ball across an oscilloscope display, with a simple physics simulation and an audible signal on impact. Brookhaven distinguishes this entertainment purpose from Nimrod’s demonstration and OXO’s research role. After an improved showing in 1959, the equipment was salvaged for parts.
There is a technical wrinkle in calling it a “video game”: an oscilloscope displays changing voltages and does not use the raster process implied by a strict technical definition of video. Tennis for Two looked like a moving game on a screen, but its display technology differs from raster video.
1961–62: Spacewar! connected computing experiments to a wider game culture
MIT acquired a DEC PDP-1 in 1961. Russell, Graetz, and Wiitanen conceived Spacewar!; Russell wrote its first version, and Samson, Edwards, and Graetz made major improvements in spring 1962. The two players piloted the Wedge and Needle around a star field, firing while gravity affected their movement. Spacewar! was not originally sold as a commercial product; DECUS distribution helped it circulate among technical and university users.
The Computer History Museum describes the PDP-1 program’s computing demands and distribution in its PDP-1 restoration account. The Strong National Museum of Play later describes Spacewar!’s cultural and arcade influence, quoting computer scientist Alan Kay: “the game of Spacewar blossoms spontaneously wherever there is a graphics display connected to a computer” (The Strong’s Spacewar! account).
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Was Tennis for Two the first video game?
It is a strong answer if the criterion is an early electronic game created primarily for public amusement and shown on a screen. Brookhaven’s history identifies it as an important early video-game milestone, while also rejecting a single unqualified “first” winner. Its oscilloscope display complicates the strict technical label “video game,” and earlier inventions qualify under other definitions.
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So the precise answer is: Tennis for Two was an early screen-based electronic game designed for fun, not an uncontested first under every definition of computer or video game.
What was Nimrod?
Nimrod was Ferranti’s 1951 computer built to play Nim, the match-removal game. It used fixed lights to show the game state and was presented as a demonstration of computer processing, beginning at the Festival of Britain. It was a computer-game machine, but not a moving-image CRT game or a project primarily designed to entertain players.
How to choose the right “first”
- Earliest documented video-game predecessor: Brookhaven identifies the 1948 Cathode-Ray Tube Amusement Device, with the qualification that physical overlays represented targets.
- Early dedicated computer-game machine: Nimrod (1951), a computer demonstration that played Nim.
- Early graphical computer game: OXO (1952), a CRT-based EDSAC research program.
- Early computer game made for amusement: Tennis for Two (1958), built as a visitor attraction.
- Early influential game shared among computer users: Spacewar! (1961–62), developed on MIT’s PDP-1 and distributed through technical networks.
These are different achievements, not rungs on one universally accepted ranking. Their importance lies in the distinct purposes they served: demonstrating processing, studying interaction, entertaining visitors, and exploring graphical computing.
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