This is the only Mod that perfectly mixes Doom 1 with Doom 3:
* Weapons look & sound adjusted to resemble Doom 1. Held in (almost) center of
* Monsters Look, attacks, values & sounds adjusted to match Doom 1.
* Classic HUD
This is full replacement pack for Opposing Force. This will replace every syngle NPC in the game. (and some sounds) The NPC's (monsters) are High Resolution! I think it's better than OP4:Redux. This pack were made by Liquidator. (one of the creators