Phobos: Anomaly Reborn

Phobos anomaly reborn is a wad by  Christopher Lutz. Just like his other maps this wad is ultra detailed, with realistic environments, from an hangar with ships and transport rails to a moving train and beyond. It is meant to be a replacement of the first Doom episode. However, it is much more difficult than the original, with bigger puzzles, and stronger enemies appearing earlier, such as baron of hell in level two.