Need a new challenge in DOOM 2 but the Nightmare difficulty level is too much for you?
I think one of the biggest problems in pretty much all FPSes is that you always have too much ammo, so I made this little patch. It's pretty simple: all monsters now have 2x health (except for Lost Souls). Good luck, and remember to use your ammo very, VERY carefully. At first, it's not really any harder, but as you'll be around level 8 it starts getting very nasty.
I once got through the whole game at Ultra-Violence with this patch, and I suggest everyone to try it (maybe except you hardcore players who can finish the game at Nightmare). I can honestly say this was the most fun I ever had clearing a FPS in single-player.
(btw, to use this patch under ZDoom : zdoom.exe -bex monster-health-x2.bex)