Maze War
Maze War, developed in 1973, is one of the earliest first-person shooter games and was a significant contribution to the development of the video game industry. The game's use of a first-person perspective, the ability to move and shoot simultaneously, and the use of virtual environments to create a sense of immersion established many of the conventions of modern first-person shooters. Additionally, Maze War was one of the first games to be played on multiple computers connected over a network, which laid the groundwork for online gaming.
The ability to play with others in a virtual world paved the way for multiplayer games, which have become a staple of the video game industry. The game's impact on the industry can still be felt today, and it is considered a significant milestone in the history of video games. Without the innovations introduced in Maze War, the development of first-person shooter games and online multiplayer gaming may have been significantly delayed, and the industry may have taken a different path altogether.