Put Aliens, Evil Dead and a bunch of cheesy metal albums into a blender and you get this weird but iconic S.O.B.

The core gameplay mechanics have aged surprisingly well and so have the visuals, and the higher difficulties really get your blood pumping. However, the level design starts to wear a little thin by the third chapter, and no matter how iconic it is, the soundtrack really is just average-to-bad MIDI renditions of old heavy metal songs.

Come for the first few vanilla playthroughs, stay for the hundreds of modded campaigns.