Then you've got the connections inside the games themselves. DOOM II actually takes you into Wolfenstein territory through its secret levels.

Then you've got the connections inside the games themselves. DOOM II actually takes you into Wolfenstein territory through its secret levels. There's a secret exit in Industrial Zone that leads to MAP31: Wolfenstein. It recreates the first Wolfenstein 3D level, with changes to fit DOOM. The guard dogs, for example, are replaced by demons. From there, you can go back to DOOM II's regular campaign or find another secret level based on Wolfenstein. That one brings in a Cyberdemon and those hanging Commander Keen figures. So all three of these games show up together again, right there in DOOM II. Bethesda has its own breakdown of those levels if you want to see what I'm talking about: https://t.co/wQSTsmGUgg I love little connections like that. Especially when you go back to an older game and realize how much stuff was already being tucked into it.