Doom (1993 video game)
The ability for others to create custom levels and otherwise modify the game using WAD files turned out to be a popular aspect of "Doom". Gaining the first large mod-making community, "Doom" affected the culture surrounding first-person shooters, and also the industry. Several future professional game designers started their careers making "Doom" WADs as a hobby, among them Tim Willits, who later became the lead designer at id Software.
Doom (1993 video game)
In "Doom", players assume the role of an unnamed space marine, who became popularly known as "Doomguy", fighting his way through hordes of invading demons from Hell. With one-third of the game (nine levels) distributed as shareware, "Doom" was played by an estimated 15–20 million people within two years of its release, popularizing both the business model of online distribution and the mode of gameplay, and spawning a gaming subculture. In addition to popularizing the first-person shooter genre, it pioneered immersive 3D graphics, networked multiplayer gaming, and support for customized additions and modifications via packaged files in a data archive known as "WADs". As a sign of its effect on the industry, first-person shooter games from the genre's boom in the 1990s, helped in no small part by the game's release, became known simply as ""Doom" clones". Its graphic violence, as well as satanic imagery, made "Doom" the subject of considerable controversy.