Europa 1 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. One of many user created maps is Europa 1.

To install Europa 1, you need to have ZDoom and unzip the WAD files into the GZDoom folder, which is pretty par for the course for DOOM mods.

The premise of this map is that Hell has invaded Europa. After a far too long time of no contact with the Europa base, your commander sends you on a suicide mission to scout the area with nothing but a pistol.

This is a massive, difficult level with several major gimmicks. The first gimmick is immediate, with six teleporter alcoves greeting you as soon as you start. Another is that there are multiple copies of colored skull keys. You only need one of each to reach the exit, so why? Well, it turns out that they create a helpful pictograph to relate their purpose. You'll need to pay attention to these to get to the end with enough firepower to beat the final boss.

If you're a fan of DOOM and especially Erik Kain's style of close quarter combat, then you should give Europa 1 a download. It is a much larger map than his other works and has a lot of qualities not found in many other maps.