“Doom” dropped for MS-DOS on December 10, 1993, and it basically redefined PC gaming overnight. id Software let you run around in first-person, blasting demons in fast, violent, 3D-ish corridors—and it was so far ahead of its time that it made most other games feel ancient. The original shareware release gave you Episode 1 for free, and by 1994, “Doom II: Hell on Earth” cranked things up with new levels, the Super Shotgun, and nastier monsters. The game kept evolving with Ultimate Doom (1995), which added a fourth episode, and tech-savvy players were already modding it with custom WAD files. If you had a 486 PC and a Sound Blaster card, you weren’t just playing a game—you were part of the LAN-party revolution that turned basements into battle arenas.