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)
On March 12, 2007, "The New York Times" reported that "Doom" was named to a list of the ten most important video games of all time, the so called game canon. The Library of Congress took up this video game preservation proposal and began with the games from this list.