Doom3

So last night I finished Doom3. I did finish it on the medium level of course. I'm now playing it on the hard level. I think I'll play a couple of days on this level and if it looks like it's doable I'll move things up and play on nightmare level. If I remember correctly from past doom games that level the bad guys respawn after you kill them. So it's best to just keep running and don't look back. I'm not crazy about playing that way. I want to clear the place out so I have a safe zone around me in case I get into trouble. Anyway, we'll see I guess.