zombieshavebrains said:Yeah just Dooms. Is Final Doom just like a Doom 2 expansion?
http://en.wikipedia.org/wiki/Final_Doom
Two fan-made level packs using content from Doom II, but were "officially" released as a standalone Doom product for the PC and PlayStation. MUCH harder than the original two, though. These were made by hardcore Doom guys back in the day, and they're even worse now since no one plays Doom as much as they did in the mid 90's.
And if we're being really strict on Doom games between Doom II and Doom 3, there's Doom 64 to consider, though in the context of Steam that's a bit of a moot point.