LighthouseUnderground addon

Steps to play:
1. Please download GZDoom from
Zdoom.org
2. Install GZDoom via Unzip it in desired folder.
3. Unzip LighthouseUnderground.zip in desired folder.
4. Drag'n''Drop LighthouseUnderground.wad over gzdoom.exe
5. Choose difficulty of the game (challence is depends on chosen difficulty)
6. Enjoy

This level can be player in Brutal Doom as well.

After Doomguy alone managed to get rid of the demons on one of Jupiter's and Martian's moons and Earth, UAC breathed a sigh of relief. Invasion was over.

However, the teleportation experiments didn't stop, nor did the demons' attempts to enter our world.

Fifty years later, after the events that took place in Doom II: Hell On Earth, scientists have achieved impressive teleportation experiments - no more cases where a human could be teleported to Venus instead of a nearby laboratory.

Meanwhile, the new management of UAC decided to resume teleportation experiments on Fobos, despite the protests of scientists.UAC management believes that it's been a very long time, and there can be no re-invasion of the demons.

But for the forces of the Underworld, fifty years is just one moment, and having tasted human flesh once, the demons will crave that flesh forever.

After a series of successful experiments, the scientists on Fobos reported to the UAC communications center on Earth that all was successful. They did not yet know that the portals they opened did not lead in two directions, but in three. One of the teleportation paths was just from the underworld to Earth.

Once again Doomguy had to unholster his shotgun...