Doom I/II (1993) bestows the divine gift of DeathMatch, demos/replays, modding, engine licensing
Channel: xplayn
Date: 2019-04-23

From The Esports Exhibit at Xplayn: https://www.youtube.com/playlist?list=PLJunMH388IKlKg9jymVT2MtBaW6eI-w5J
Doom: introduces DeathMatch mode on LAN/dial-up connection. It is hard to overstate the impact that Doom had on modern gaming. Online duelling, DeathMatches, demos/replays, MOD tools were all  invented here, introducing an entirely new dimension to gaming.

Source: Frag (2008) www.imdb.com/title/tt1266566/