Winter's Fury 1.0

DOOM is one of the oldest FPSes in existence, and its engine is famously so robust that it can run on pretty much anything and also create pretty much anything.  From FPSes to RPGs to companions to a city living game, it has a ton of different mods and maps that can all do different things. There are even full campaigns created called megawads. One of many is Winter's Fury.

To install Winter's Fury, you need to have ZDoom and move the WAD file into the GZDoom folder, which is pretty par for the course for DOOM maps.

Some thought's gone into the narrative. The story takes place in a world where humanity won the war on Earth against the demons. The humans trapped an uber-demon under the mountains of Siberia. Of course, they pick up demonic signatures here and the initial exploration team doesn't report back. So they send you in. The narrative is actually fairly well put together and there's even a side story revealed through hidden logs found throughout each level.

All of the weapons have been modified, and there are a ton of new monsters. While many of these monsters look simply like recolors, they actually behave quite differently and have unique strategies that you need to use to defeat them. All in all, this is a very interesting and unique set of maps. If you were interested in a DOOM wad that has a lot more thought put into the narrative, you should give Winter's Fury a download.