Multi-player started with Doom 2. Original doom was single player only. Doom 2 was for 4 players which I used in my mod ArsDoom. Quake then extended it to scale

Multi-player started with Doom 2. Original doom was single player only. Doom 2 was for 4 players which I used in my mod ArsDoom. Quake then extended it to scale via a dedicated quake server.