Early history of video games
Throughout the rest of the 1960s, digital computer games were created by increasingly numerous programmers and sometimes sold commercially in catalogs. As the audience for video games expanded to more than a few dozen research institutions with the falling cost of computers, and programming languages that would run on multiple types of computers were created, a wider variety of games began to be developed. Video games transitioned into a new era in the early 1970s with the launch of the commercial video game industry in 1971 with the display of the coin-operated arcade game "Galaxy Game" and the release of the first arcade video game "Computer Space", and then in 1972 with the release of the immensely successful arcade game "Pong" and the first home video game console, the Magnavox Odyssey, which launched the first generation of video game consoles.
Bertie the Brain
"Bertie" was created only three years after the 1947 invention of the cathode-ray tube amusement device, the earliest known interactive electronic game, and while non-visual games had been developed for research computers such as Alan Turing and Dietrich Prinz's chess program for the Ferranti Mark 1 at the University of Manchester, "Bertie" was the first computer-based game to feature a visual display of any sort. "Bertie" is considered under some definitions in contention for the title of the first video game. While definitions vary, the prior cathode-ray tube amusement device was a purely analog electrical game, and while "Bertie" did not feature an electronic screen it did run on a computer. Another special-purpose computer-based game, "Nimrod", was built in 1951, while the software-based tic-tac-toe game "OXO" and a draughts program by Christopher Strachey were in 1952 the first computer games to display visuals on an electronic screen rather than light bulbs.