There are quite a few Classic Map Levers hidden throughout DOOM’s singleplayer campaign. As the name suggests, these levers essentially unlock a Classic Map secret. It is a good idea to check every nook and cranny to find them all.
Secret Doom Classic Level Locations
The UAC
Resource Operation
Foundry
Argent Facility
Argent Energy Tower
Kadingir Sanctum
Argent Facility (Destroyed)
Advanced Research Complex
Lazarus Labs
Bonus: Time Well Spent Challenge
Titan's Realm
The Necropolis
Vega Central Processing
Argent D'Nur
All Retro DOOM Level Locations
Source: https://gameplay.tips/guides/110-doom.html
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