I finished 3 episodes of Doom on Nightmare by making too many saves. 4th episode? No way! I could not even pass the first map of Episode 4 on Nightmare. As for Doom 2, the furthest I went was LEVEL 9 on Nightmare. I could not pass level 9. That's as far as I went.
Doom 1 (3 episodes) is easier to finish on Nightmare than Doom 2 but E2 M6 was so crazy with dark areas. It took me weeks to pass E2 M6 on Nightmare. That was the hardest map in 3 episodes on Nightmare. Other maps were much easier compared to E2 M6. With too many saves, I managed to finish 3 episodes of Doom 1 on Nightmare. As for Doom 2, the furthest I went was level 9 on Nightmare. Level 9 is so crazy to beat on Nightmare. I finished Doom 2 on both ''UV Fast'' and ''UV Respawn'' but not on Nightmare. Nighmare gives Fast and Respawn at the same time. Plus double ammos. As for 4th episodes of Doom, I just finished it on ''UV Fast'' (UV with Fast monsters)
My crazy moments in Doom E2 M6 on Nightmare. That map was terrible. But I did beat it playing it for weeks. It took a long time for me to beat this crazy map. I had to start this map from the beginning again and again and again and again. Nightmare is giving me Nightmare!