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.
List of esports games
Doom is a series of multiplayer 1v1 and free-for-all deathmatch games developed by id Software. Doom is notable for establishing the arena-style deathmatch format, and also was partially responsible for the first online FPS community through DWANGO, an online gaming service officially endorsed and partially worked on by id Software. People also played Doom deathmatch online through other BBS services. The Ultimate DOOM and "Doom II," alongside Heretic, were played in the Deathmatch '95 tournament, sponsored by id Software, Microsoft, and DWANGO. This tournament, perhaps the first PC esports tournament of its kind, was played through the online DWANGO service. Finalists from the US and the UK were flown to Microsoft headquarters to compete in a LAN party format event, named Judgement Day. Dennis Fong, best known for his victory at the Red Annihilation tournament for "Quake", won Judgement Day, marking his first entry into esports. Doom II was also played in Cyberathlete Professional League and QuakeCon tournaments.