NECROMANCER
Hard Data:
Vanilla Doom, No custom assets, All genuine Doom textures and monsters
Port: GZDoom
Format: UDMF
IWAD: Doom 2
Does NOT require jumping, freelook or other software renders
Details:
3 Level WAD
Power Source, Baalstrom, Black Bone Fortress
All levels were meant to have a genuine Doom feel to them. They have a moderate amount of monsters and have all been tested for difficulty. These were meant to be played on Ultra Violence, but still include toned down difficulty settings. These are about as difficult as your average to late Doom 2 levels.
DEATH KING
Hard Data:
Vanilla Doom, No custom assets, All genuine Doom textures and monsters
Port: GZDoom
Format: UDMF
IWAD: Doom 2
Does NOT require jumping, freelook or other software renders
Details:
3 Level WAD
Toxicity, Bloodpool, Castle Obsidian
The first level is built like your normal Doom 2 level, the second level is a maze and the third level is a semi-slaughter map for extra difficulty. None are too difficult as far as I could tell as there is plenty of ammo and healing items throughout, but it is still meant to hurt a bit. The main point is for fun. They are all meant to be played in Ultra Violence.