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I'm probably doing something wrong but I can only get credits for Doom 2.

Hm, do you mean the in-game credits screen or the map titles shown during intermission? I should have specified, the credits I just added are the latter. Although I would like to design an all-new credits screen at some point, to include the people who worked on the non-Doom 2 releases.

I mean the intermission credits like the ones you provided screenshots of.