1. I guess in 2011, my father lend me his laptop to play since I was not at home and he showed me Doom, I think I played a save of DOOM II on MAP05 on skill 3 or 4, I remember about playing until the exit of MAP06 and finishing with 2% of health.
2. 1.666 I think.
3. I used to play with keyboard, slow, taking cover and saving every time I could, I also used to waste too much ammunition so I ran out of it very quickly and I needed to use the fists.
4. I have nice memories about it, when I started playing Doom (I started with Doom I once I had it in my computer) it was a surprise every time a new monster came out, then I played Doom II, Heretic, Plutonia, Hexen and Evilution (in that order) and I also have good memories of passing those levels (sometimes thinking a specific level was impossible).