Beat Classic Doom a few days back for the first time.
The game aged beautifully. The challenge and labyrinthine mapping made for an amazing adventure. I have to say, it really trains the reflexes for shooters, surprisingly.
Congrats! I just recently beat episode 4 myself. What was your favorite level?
Honestly all of Episode 4 was fantastic levels of chaos. It was such a drastic jump in difficulty, but it was so fun!