DOOM turned 21

Today, one of the most significant games in the industry is 21 years old!
It was December 10, 1993, one of the companies, the founders of 3D shooter software id released Doom. John Carmack and John Romero created such an interesting universe and a cool setting in this game that first-person shooters became the most popular genre.
It is thanks to Doom that this kind of multiplayer game like Deathmatch has appeared, the number of ports of the game is no longer amenable, it is mentioned in movies, TV shows, books and even other games.
All IDDQD! Post nostalgia.