Let the Obsession begin. Again. This time, the entire forces of the netherworld have overrun Earth. To save her, you must descend into the stygian depths of Hell itself! Battle mightier, nastier, deadlier demons and monsters. Use more powerful weapons. Survive more mind-blowing explosions and more of the bloodiest, fiercest, most awesome blastfest ever! Play DOOM II solo, with two people over a modem, or with up to four players over a LAN (supporting IPX protocol). No matter which way you choose, get ready for adrenaline-pumping, action-packed excitement that's sure to give your heart a real workout.
Mirror upload of this mod made by an unknown author. This is the lastest version I found so far. Mod includes weapons from Killing floor, as well as a perk system and some custom monsters.
The mod is pretty cool, but for me here the hud is so huge...
If you want to play it only with the custom weapons, you can check this other version here: Moddb.com