Early Electronic Games
The early period of video games were severely limited in the technology of the time. One of the first, Tennis for Two by William Higinbotham, was simply an oscilliscope that showed one dot moving across the screen. It was built in his lab in Brookhaven to help entertain them.  There was no interactive playing of the game, but it proved that computer technology could be used for fun.
The first playable video game arrived in 1961: Spacewar! This game was created for a model railroad club by Steve Russell at MIT after over 200 hours of work. Spacewar! was the first time people could interact with the onscreen video by using a controller  Like Tennis for Two, there was no feasible way to mass produce the game, as the computer that ran it cost over $100,000.
 Meadows, Andre, host. "The Dawn of Video Games: Crash Course Games #3." Crash Course, 15 April 2016. Accessed 16 April 2016. http://www.youtube.com/watch?v=IGLdlkZozpI
 Kent, Steven L. The Ultimate History of Video Games. New York, NY: Three Rivers Press. 2001. 19